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. The body is made from 4140 alloy steel with a black oxide finish. Smooth jaw is made from 4140 alloy steel, quenched and tempered, and precision ground. The t-slot nut is made from 1045 steel with a black oxide finish. The socket head cap screw is made from 4135 steel with a black oxide finish.