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WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) | 5/8"… is sold through Amazon. Amazon Prime members generally receive free 1-2 day shipping; non-Prime orders are subject to Amazon's standard shipping rates. Full returns policy applies per Amazon Associate terms.

WRS

WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) | 5/8" Channel, Non-Tilt/Side-Load Window, Pre-Assembled w/ Guides, Galvanized Steel, Sold Individually, Res. & Commercial, DIY

Name: WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) | 5/8" Channel, Non-Tilt/Side-Load Window, Pre-Assembled w/ Guides, Galvanized
Brand: WRS
SKU: B086R63HF7
Price: 7.89 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-06

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 →

$7.89

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*Price sourced from Amazon.com. Price and availability subject to change.

Bottom line: The WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) | 5/8" Channel, Non-Tilt/Side-Load Window, Pre-Assembled w/ Guides, Galvanized Steel, Sold Individually, Res. & Commercial, DIY is a niche pick — read recent reviews before buying in the retro software & media category, priced around $7.89. Compare close alternatives before committing.

SpecPicks Verdict

SpecPicks scored WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) |… 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. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

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.

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

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 22" inches in length and supports 8-12 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	‎21-2 (8-12 lbs)
Brand	WRS
Color	‎Metal
Style	‎American
Finish	‎Unfinished
Weight	44 lb
Part Number	‎01-30021-2
Batteries Required?	‎No
Included Components	‎Series 300 Block & Tackle Balance
Item Package Quantity	‎1

Ready to buy?

WRS Series 300 Block & Tackle Balance – 22" Stamp 21-2 (8-12 lbs) | 5/8" Channel, Non-Tilt/Side-Load Window, Pre-Assembled w/ Guides, Galvanized Steel, Sold Individually, Res. & Commercial, DIY 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. Price and availability subject to change.