T-Slot Milling Cutters Model Number : Drill Bits DIY Supplies : TiLing Material : Tungsten Carbide Type : Center Drill Bit Use : Masonry Drilling Length : 3-12mm Set : 16PCS Drill Bits Set Drilling diameter : 3/3/3/4/4/4/5/5/5/6/6/6/8/8/10/12mm