This adjustable side stop allows for quick removal and insertion of parts. The large jaws offer more stopping surface. Includes T-slot nut and socket head cap screw. Body made from 4140 alloy steel with a black oxide finish. Serrated jaw made from 4140 alloy steel, quenched and tempered, with a black oxide finish. T-slot nut made from 1045 steel with a black oxide finish. Socket head cap screw made from 4135 steel with a black oxide finish.