Secturity Screws Size: Cusomized Material; Stainless Steel,Iron,Copper Standard; DIN,BS,JIS,ANSI,GB. OEM Security ScrewsSize; M12-M36 Or at your ... of all kinds of Fasteners (Nonstandard and Standard) such as Screws ( Weld / Self-tapping / Drilling / Wood / Hexagon/ Countersunk Head / etc ) , Bolts ...