A fine drill for diamonds and petroleum materials.

摘要

Improved drill bit for Drilling Stone and Stone materials essentially because his body in a Screw shape,The thread can be of any type and one or more inputs,Aims to draw the material from the Blade Tip and is designed to be manufactured by Cold RollingI.e. without removing material and Machining is an economy, an economy of material, a better Surface finish and better Internal structure of the drill.