Mo-Clamp 1300 Sill Hook (5-Ton Capacity). One of the handiest tools in the shop for a quick pull almost anywhere. New round opening allows for pulling with a slip hook. New casting process makes for a tighter grain structure, resulting in more strength. The original straight-cut tooth design pattern is machined for superior gripping and pulling power. Sill Hook end is 2-1/2" wide. Specifications: Gripping surface - 2-1/2" wide x 1" deep, Overall length - 8-1/2", Capacity - 5-tons.