Features and Benefits:Redesigned to mate with Super Stacker Cribbing Blocks pyramid surface for secure, exact fitProvides increased stability and gripping-surfaceNew pyramid surface (identical to the pyramid surface featured on Super Stacker Cribbing) on one side grips uneven terrain in the fieldLocking feature prevents the release of hazardous energy by mechanically locking loadSpecifications:Locking model, securely locks onto AME Super Stacker Cribbing Blocks (see photos)Capacity: 100 TonsLength: 24 in (607 mm)Width: 24 in (607 mm)Height / Thickness: 2 in (51 mm)Weight: 38.4 lbs (17.5 kg)Complies with OSHA regulation 29 CFR 1926.305, “When it is necessary to provide a firm foundation, the base of the jack shall be blocked or cribbed."