uxcell 3-15mm Internal Dia Woodworking Drill Bit Depth Stop Collar Set 8 in 1 Product Name : Drill Bit Stop Collar;Material : Metal Color : Black;Internal Dia(Approx) : 3mm,4mm , 5mm , 6mm , 8mm , 10mm , 12mm , 15mm Thickness : 8mm / 0.3" Weight : 67g Package Content : 8 in 1 x Drill Bit Stop Collar 1 x Wrench