Thread Forming Screw BT Head Type Pan Thread Size 6-20 Length 1/2 In Case Hardened Steel Finish Zinc Plated Driver Size #2 Head Dia 0.270 In Head Height 0.097 In For Use In Materials Such As Plastics Asbestos and Similar Compositions Meets/Exceeds ANSI B18.6.4 Package Quantity 20 000