1/8" Shank Diamond coated Cylindrical Grinding Mounted Point Bits Burrs Fits Dremel Type Rotary Tool , 4 mm head , 10 pcs Product Name : Diamond Mounted Point;Tip Shape : Cylindrical Material : Metal, Diamond;Head Diameter : 4mm/ 0.31" Head Length : 13mm/ 0.51";Shank Diameter : 3mm/ 0.118" Total Length : 45mm/ 1.8";Color : Silver Tone Weight : 26g;Package Content : 10 x Diamond Mounted Point