SOCKET SET SCREW, CUP POINT, STEEL ALLOY, THERMAL BLACK OXIDE, UNC, 100 PK, 10-24 X 1/4" SET SCREWS HAVE FORGED SOCKETS, INSURING MAXIMUM STRENGTH AND RESISTANCE TO CRACKING IN THE CORNERS. SMOOTH, FLAT, DEEP SOCKETS, FREE OF MACHINING TEARS OR ROACH CHIPS.