... /medium/high carbon steel) Stainless steel, Aluminum alloy,Surface Treatment: Chrome plating, Silver plating, Zinc plating, Nickel plating, Tin-plating, Passivate ... and etc. 2. by head types Flat, Oval, Binding, Pan, Round, Truss, Button, PF, Pan washer, Cheese, Countersunk, Fillister, hexagon, Hexagon ... delivery and good service.www.jielimetal.com.cn Cross Recessed Round Head Screw Bolt JL-SCR-100