Professional mushroom nail tyre repair drill bit, can be used with low-speed pneumatic drill High-quality raw materials: high hardness, wear resistance, strength and toughness, heat resistance and corrosion resistance Fish scale , edge, sturdy and Triangular rhombus cutting design, anti-skidding and use more firmly Colour:Silver Material:alloy steel Size:Shank diameter 6mm/8mm Package Contents: 2 x Drill Bit 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.