FLANGED, SLOTTED, PHILLIPS TYPE; HARDENED C1018 STEEL MATERIAL; 1/2 INCH; 1/4 INCH HEAD WIDTH ACROSS FLAT; .5 LENGTH - DECIMAL; 1/2 LENGTH - FRACTIONAL; #7 NOMINAL DIAMETER; #7 NOMINAL DIAMETER - FRACTIONAL; .151 NOMINAL DIAMETER - DECIMAL; TWIN FAST