High quality: wood drill bits made of premium high speed steel for high hardness, high abrasion resistance and high heat resistance. 1/4" shank size is suitable for most electric and cordless drillsMain Function: Woodworking rotary drill bits are available for handling wood, non-ferrous metals, plastic and rubber, soft materials, etcUsage: Rotary drill bits are available for handling wood, non-ferrous metals, plastic and rubber, soft materials, etcContents: 5 shapes: ball, oval, cylinder, large cone, small cone. 6mm shank suitable for most electric and cordless drills Convenient control: simple rotary file, safe and reliable, no dust pollution, improve the working environment.Features:Material:Steel.Color:GrayHandle diameter :About 0.63mm.Length:As picture shown.Quantity:5pcs.Scope of application:Used for grinding, polishing, surface removal and corrosion.Contents:5pcs rotary burr set.