1.Material:stainless steel 2.Shape:star lock washer 3.Tolerance:+/-0.05mm 4.We make standard and non- ... hexagon, Hexagon washer head, Hexagon socket button head and etc.3. by type of drive insertsPhillilps, Slotted, Pillips/slotted combination, Cross recess ... type, H drive, Hexagon socket, Square socket, Torx, Triangle drive, ...