... 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 ... 162.292.441/8103.30 / 3.205.64 /5.383.45 / 3.403.42.232.362.51109½3.66 / 3.568.10 / 7.803 ...