self drilling screw 1.feature:hex head,drill-shaped point. 2.material:carbonsteel 3.finished:zinc ... selfdrilling screw, countersunk head self drilling screw, wafer/frame head self drilling screw, slotted countersunk head, cross recessed countersunk head…..Material: carbon steel ... .5/4.8/5.0*19---60mm,Feature:pan head, drill-shaped point.Head type: hex/ wafer/frame/countersunk headFinished: galvanized ...