8 Pcs Drill Bit Depth Stop Collar 3 To 16mm Carbon Steel Drilling Limit Ring for Woodworking 1[Enhance Woodworking Accuracy] The drill bit depth stop collar set allows you to control drilling depth with accuracy, ensuring precise and consistent results. 2[Carbon Steel Material] Made from carbon steel and treated with oxidation, these limiting rings have high hardness and wear resistance, providing long lasting performance. 3[Versatile Set] The 8 piece set includes stop collars in various sizes (3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm), offering versatility for different drilling needs. 4[Secure Locking] These drill stop bit collars can firmly lock the drill bit without slipping, ensuring stability and accuracy during drilling process. 5[Easy to Use] Simply attach the limiting ring to your drill bit and adjust the desired drilling depth. This set is a convenient tool for both beginners and experienced woodworkers. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.