Features: brand new and high quality Material: Manufacture of high-quality high-speed steel, long service life, very accurate for first cutting, energy and pressure. The diameter of the handle is controlled by about1 /8"; the cutting handle has a minimum depth of 3 mm. Wide application: This router bit set must be a valuable supplement, your rotating tool, this is for the most popular rotating tools. 20 most commonly used router drill bit types, including linear, trim, V-slot type, curled, concave, groove, etc. to meet your different needs. Can be used in wood, copper, aluminum, metal, ABS, acrylic acid, PVC, nylon, resin, plastic, etc. Specifications: Material: High Speed Steel DIY Supplies: Woodworking Type: Woodworking Rotary Handle form: round handle Size: As the Picture Shows Range: Metal, jade, wood, fiberboard and plastic, etc. Note: 1.Please allow 1-2mm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 20 Pcs x Engraving Bits