uxcell 7 in 1 3-12mm Inner Dia Drill Bit Depth Stop Collar w Wrench Set Black Product Name : Drill Bit Stop Collar;Material : Metal Color : Black;Internal Diameter : 3mm,4mm , 5mm , 6mm , 8mm , 10mm , 12mm Thickness : 8mm / 0.3" Weight : 56g Package Content : 7 in 1xDrill Bit Stop Collar1 x Wrench