5 in 1 3-8mm Internal Dia Drill Bit Depth Stop Collar Set Black Product Name : Drill Bit Stop Collar;Material : Metal Color : Black;Internal Diameter : 3mm,4mm , 5mm , 6mm , 8mm Thickness : 8mm / 0.3" Weight : 33g Package Content : 5 in 1 x Drill Bit Stop Collar 1 x Wrench