Bessey XCRU5 Deep Reach Ratcheting Spring Clamp 4_Inch capacity, 4-Inch Throat Depth Square throat design 4-by-4-Inch and quick release trigger Clamps are made of high strength glass filled nylon Handles are manufactured with 2 component soft grip design for comfort and durability Pivoting soft jaws include V groove for holding round stock Pivoting jaws self align on uneven surfaces