Brass self-tapping screws seriesBrass is an alloy of primarily copper and zinc. It is surprisingly strong but a very soft metal. And it is highly corrosion resistant and electric conductor. Standards: ANSI, BS, DIN, JIS, etcSpecifications: Head Type: Flat head, Oval head, Round head, Hex headDrive Type: Phillips, Square, Slotted, Phillips/Slotted, Torx, Pozi, HexagonDiameter: #2 - #16 Length: 1/4" - 6"Features: Material: BrassSurface finish: Self colour, PicklingInner packing: Polybag or as customers’ requests Outer packing: Carton or as customers’ requests