[Screw Tip]: The screw tip allows the drill bit to feed itself, making it easy to quickly drill holes in hard and . Material: Made of high carbon steel with threaded tips to drilling life. Single straight tooth milling cutter: Single straight tooth and side lips are designed for drilling and removing debris. [Hexagonal handle]: The hexagonal handle provides better grip on the chuck and reduces slipping size: 230mm Material: metal colour: silver Package Contents: 5 x drill bits(6/10/12/20/25mm) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.