This is a custom metric screw torx driver which use in the microphone PCB, we supply for a Australia operated audio company. The thread diameter is 2.1mm, the length are 17mm, 29.5mm and 47mm. The screw manufactured through Two-die Four-punch cold heading machine, using low carbon steel (case hardened) material and zinc plating, according to customer requirements the plating are red, yellow, white and green color. For quantity 30000pcs -50000pcs the lead time 8-10 days.