Main use: Tungsten steel grinding head is widely used in industrial sectors such as machinery, aviation, automobile, shipbuilding, chemical engineering and process engraving. Finishing various metal mold cavities, such as processing shoe molds and so on. Various metal and non-metal process engraving, such as mold engraving, trimming of craft gifts. Clean the flash, burrs and welds of castings, forgings and weldments, such as machine-casting plants, shipyards, automobile factories, etc. Chamfering and groove processing of various mechanical parts, cleaning of pipes, finishing of the inner hole surface of mechanical parts, such as machinery factories, repair shops, etc. Finishing of the impeller runner, such as an automobile engine . Product Name: Carbide File Weight: about 95g set Colour: silver Material: Steel size: 3x3mm Package Contents: 20 x Double-grain Mixed Model File Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm. Have a great time shopping!