... need for complicated, time consuming and sometimes expensive joinery systems like dovetailing, dowelling and other traditional methods. Self tapping ... Screw Types: Drywall Screw, Chipboard Screw, Subfloor Screws, and Decking Screw Head Types: Bugle Head, Double Countersunk Head, ... regards & sincere friendship, Contact: Mr Clark Huang For and On Behalf Of BaiEr company Ziqiu,Pingyi,Linyi,Shandong, ...