self drilling and self tapping screw 1.Head tpye:HWH,HFH,PAN HEAD,FLAT HEAD,BUGLE HEAD ect. 2.Size:#6,#7,#8,#10 ... ,#12,#14 self drilling and self tapping screw SUPPLIER:Material:carbon ... steel C1022 or C1018Finish:zinc plated,painting,dacromat,RuspertSize:#6,#7,#8 ...