IHI1669 Features: * Tool removes 1/4" (6mm) to 3/4" (19mm) studs * Cam wheel grips within 9/32" of flat surface to hold stud * Drive socket will not bindHere"s a great tool for removing studs easily and cleanly without pliers. Use with a 3/8" drive ratchet and, if needed, extension. * Studs Cam Style Stud Remover 1/4"" to 3/4"" Warranty: * Lifetime warranty does not cover abuse