The Morgan Mfg. Slide Hammer Hooks offer users a 1/2" diameter family of hooks for use on aluminum vehicles. The hard chrome hooks won’t cause galvanic reaction with aluminum panels and members. These heat-treated and case-hardened chrome moly steel base metal hooks are for use with aluminum only and offer 1/2 to 13 threads for the BS-16B body. Four designs are included: Small Hook (No. BS-16SA), Large "J" Hook (No. BS-16LA), Round Right Angle Hook (No. BS-16RA) and Round Right Angle Hook with Flat Milled Surface (No. BS-16RFA). These Slide Hammer Hooks are made in the U.S.A.