1/2-13 x 2-1/4" 12 Point Flange Screw - 170M PSI - Steel - Plain - Partial Thread - UNC - Pkg of 10 - B2176470

TWELVE-POINT DRIVE TYPES HAVE A COMPACT HEAD SHAPED INTO TWELVE TRIANGULAR POINTS. THEY DISTRIBUTE TORQUE WELL AND ARE USED WITH TWELVE-POINT WRENCHES AND SOCKETS.