... Long Screw, Available in Various Sizes Head type: CSK/flat head, truss head, trumpet head, wafer head, pan framing head, pan wafer head, hexagon head, pan ... , Philips, Square, HWF undercut, HWH, serration, flower head and othersPlating: plain, yellow zinc, zinc, black phosphated ... black zinc, black oxide, dacrotized, ruspert, xylanPacking: in bulk, standard packing for exportThey have good quality, ...