Product Description: Material: high speed steel Shank diameter: 3mm (1/8") Tail length: 38mm (1.49") Quantity: 10pcs Purpose: Suitable for electric cutting machine, wood cutting, milling groove and so on Caution: When you use these drill bits, the temperature of the material (wood , ABS, acrylic, PVC, plastic, etc.) becomes very high, add water or coolant to prevent the material from emitting smoke when used. 10 bits router kit including straight, trim, V-groove, beading, cove, slot cutter and more to meet your different needs; Made of high quality high speed steel, 1/8" shank (3 mm), length: 38mm, user-friendly design and easy insertion process; Usually used on electric trimmers for wood cutting, milling and other processing. Suitable for most rotary tools Capable of engraving on a wide range of materials: wood, ABS, acrylic, PVC, plastic, etc Perfectly suitable for detailed work, such as building and sanding dollhouse furniture, model trains or model buildings and airplanes.