Sorry but I don't know why it's called 'Heavy Duty'. It's not as durable as my old Warner block. The bolts are smaller (as are the wing nuts), making them difficult to tighten with my old hands. Better than the plastic ones sold in stores now, of course, but hardly.
MAPORCH 2 Pack Steel Wool And Gap Blocker Set - 3.2βX7.5 Ft Control Fill Fabric And Brass Wool For Protection Against Animals, Wall Cracks, Vents, And Pipeline In Garden, House, And Garage
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USA Made Diamond Lapping Paste Polishing Compound 600 Grit Mesh 22-36 Microns For Rock Glass Metal Jewelry Resin Marble With High Concentration Of Diamond Powder By TechDiamondTools
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π Enhanced Superfine Assortment: Various Sizes, Multi-purpose, and Reusable
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