... , Heat treatment, Plating, Anti-slipping patchCategory: 1. by components Bolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws, Washers/Gaskets, Check ... head and etc. 3. by type of drive inserts Phillilps, Slotted, Pillips/slotted combination, Cross recess type, H drive, Hexagon socket, Square ... and good service.www.jielimetal.com.cn Cross Recessed Round Head Screw Bolt JL-SCR-100