uxcell 3mm Shank 8mm Dia Tip Diamond Points Grinding Drill Bit 4 Pcs Product Name : Grinding Drill Bits;Shape : Cylindrical Material : Alloy;Shank Diameter(Each) : 3mm / 0.12" Each Length : 45mm / 1.77";Tip Diameter : 8mm/ 0.3" Color : Silver Tone;Total Weight : 28g Package Content : 4 Pcs x Grinding Drill Bits