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WRS

WRS Series 300 Block & Tackle Window Balance – 5/8″ Channel, 12″ Length, Stamp 11-9 (15-18 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows | For non-tilt side-load windows, galvanized steel construction, includes top and bottom guides, smooth quiet operation

Name: WRS Series 300 Block & Tackle Window Balance – 5/8″ Channel, 12″ Length, Stamp 11-9 (15-18 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty
Brand: WRS
SKU: B081TL2YT8
Price: 9.09 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-21

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$9.09

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🛒 See live eBay price Also on Amazon — View Current Price → Compare to similar retro software & media

*Price sourced from Amazon.com. Last updated 2026-08-13. Price and availability subject to change.

Bottom line: The WRS Series 300 Block & Tackle Window Balance – 5/8″ Channel, 12″ Length, Stamp 11-9 (15-18 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows | For non-tilt side-load windows, galvanized steel construction, includes top and bottom guides, smooth quiet operation is a specs-and-price decision rather than a crowd-consensus one in the retro software & media category, priced around $9.09. Check the specification table above against one or two close alternatives — on price and spec fit, not on star ratings.

Pros & Cons

Pros

✓ Backed by WRS's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Bring your windows back to smooth, reliable operation with the proven performance of the WRS Series 300. The WRS Series 300 is a professional-grade replacement balance designed for non-tilt, side-load window systems. Using a precision spring-and-pulley mechanism, it counterbalances your window sash for smooth, controlled lifting and secure closing. Built with a 5/8″ galvanized steel channel, this balance delivers lasting strength, corrosion resistance, and dependable performance in both residential and commercial settings. Compatible with most vinyl and aluminum single- or double-hung…

SpecPicks Verdict

SpecPicks scored WRS Series 300 Block & Tackle Window Balance – 5/8″ Channel, 12″… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the retro software & media category. WRS's retro software & media lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for retro software & media of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Key Features

ENGINEERED FOR NON-TILT WINDOWS – Designed for side-load, non-tilt window systems with a standard 5/8″ metal channel, commonly used in vinyl and aluminum single- or double-hung frames. This balance measures 12" inches in length and supports 15-18 lbs sashes. Each balance arrives pre-assembled with top and bottom guides attached, so installation is fast and frustration-free—no special tools required.
AVAILABLE IN LENGTHS FROM 8″ TO 49″ (3 TO 44 LB RANGE) – The Series 300 fits nearly all non-tilt window sizes, from light residential sashes to heavy commercial frames. Covers a complete range of lengths and weight ratings for versatile use. Each balance is precision-tested for smooth, reliable performance and long-term durability. Sold individually; accessories and hardware not included. Contact WRS if your exact size isn’t listed.
SMOOTH, SAFE & SECURE OPERATION – The Series 300’s precision pulley and spring system balances the sash to prevent slamming or sticking, keeping windows steady at any height. Designed for quiet, reliable performance in homes, schools, and offices where safety and ease of use matter every day.
HEAVY-DUTY GALVANIZED STEEL CONSTRUCTION – Crafted from high-strength galvanized steel for long-term durability and corrosion resistance. Precision pulleys and springs maintain smooth lift through thousands of cycles, ensuring reliable performance for years of daily use. Built tough for pros yet simple enough for DIY installation.
TRUSTED SINCE 1989 – WRS Window Repair Systems has over 30 years of experience supplying reliable, high-quality hardware. Trusted nationwide by homeowners, contractors, schools, and property managers for dependable repairs and long-lasting performance.

Full Specifications

Size	‎11-9 (15-18 lbs)
Brand	WRS
Color	‎Metal
Style	‎American
Finish	‎Unfinished
Weight	44 lb
Part Number	‎01-30011-9
Included Components	‎Series 300 Block & Tackle Balance

Ready to buy?

WRS Series 300 Block & Tackle Window Balance – 5/8″ Channel, 12″ Length, Stamp 11-9 (15-18 lbs), Non-Tilt Side-Load Replacement Hardware – Heavy-Duty for Residential & Commercial Windows | For non-tilt side-load windows, galvanized steel construction, includes top and bottom guides, smooth quiet operation is sold on the used and vintage market, where eBay carries the live inventory — Amazon does not stock this part. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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*Price sourced from Amazon.com. Last updated 2026-08-13. Price and availability subject to change.