Product Features:
Stainless Steel Base, Head post & Hub
Side-plates: UV-stabilized with reinforced nylon composite for maximum protection 
Block Connection: Base Mounting
Becket: No
Mounting screws are NOT included
Specifications:
Sheave Diameter: 1.58" (40mm)
Max. Line (Rope) Diameter: 0.39" (10mm)
Max. Working Load (MWL): 617lb (280kg) 
Breaking Load: 2094lb (950kg) 
Weight: 5.8oz (164gr)
Length: 2.53" (64mm)
Base plate: 2.75x2.3" (70x60mm)
Mounting holes on center: Short side:1.6" (40mm). Long-side: 2" (51mm)