... with Very Long Length Head type: CSK/flat head, truss head, trumpet head, wafer head, pan framing head, pan wafer head, hexagon head, pan headThread type ... Pozi, Philips, Square, HWF undercut, HWH, serration, flower head and othersPlating: plain, yellow zinc, zinc, black phosphated, ... in bulk, standard packing for exportThey have good quality, and reasonable price Hexagon Wafer Head Self Tapping Screw