Strap Clamps - Strap Clamp Spring Lifters - Designed to speed set-ups wherever strap clamps are used. Spring lifter slides over T-slot bolt or stud and is held by tightening the set screw on locking collar. The strap clamp rests on the support collar and the spring holds the clamp just above the final tightened height permitting the work to be quickly and easily slid underneath.[]