... 1.material: brass,steel,aluminum 2.surface: zinc,nickel,chrome 3.free sample 4.after-sales service Specifications of steel Semi ... 1) Open 2) Closed3 Material 1) Steel 2) Brass4 Diameter: 3.2mm, 4.0mm, 4.8mm, 6.4mm, (1/8'', 5 ... /32'', 3/16'', 1/4'')5 Length: 6mm - 30mm6 Head type: dome ... .90 / 2.842.851.801.932.0812113.07 / 2.975.64 / 5.383.23 / 3.173.22.062.182.34111/83.20 ...