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![Schaefer Single Aluminum Block - 51mm Sheave [504-05]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/74715XL.jpg?v=1591366309)
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Description
Schaefer Single Aluminum Block - 51mm Sheave [504-05]Single Aluminum Block 51mm Sheave Single block with anodized aluminum cheeks. Delrin sheave ensures smooth operation with high safe working load. Swivel head may be locked in place to avoid twist. Specifications: Sheave Dia. 2" (51mm) Thickness 15 16" (24mm) Width 2 1 8" (54mm) Length 4 13 32" (112mm) SWL 1750 lbs. (795kg) Weight 5oz. (142g) Max. Line size 7 16" (11mm)
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
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![Schaefer Small Opening Pre-Feeder [45-06]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/74714XL.jpg?v=1591366301)
Best in 7 days
4.2 ★★★★★
Based on 991 reviews
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Product Reviews
★★★★★ 5
Hold vest
Color: Red, Size: 3X-Large
Great look & fit !
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Reviewed in the United States on March 1, 2026
★★★★★ 5
Great vest
Color: Dark Grey, Size: X-Large
This lil vest is awesome. A little thicker than I expected but perfect for my cool office. Looks like it cost twice as much. I had my company info put on it and looks like it cost 150.
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Reviewed in the United States on April 16, 2026
★★★★★ 3
fit
Snug fit.
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Reviewed in the United States on April 26, 2025
★★★★★ 5
Ordering one of each color
Color: Dark Grey, Size: X-Large
Good quality for price. Probably the best item i have ever bottom off Amazon and this int a lie. I love this 1/4 zip vest. Works perfect.
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Reviewed in the United States on April 25, 2026
★★★★★ 1
To heavy
Color: Black, Size: X-Large
Vest is heavy and frankly very warm can’t see in what environment I’d wear it because at 40-50 I would use light down coat with sleeves I returned from t same day I reviewed it
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Reviewed in the United States on January 8, 2026
