Features: Achieve precise drilling depths with this 7 piece drill bit depth stop set, featuring adjustable collars (3-12mm) and durable carbon steel construction for consistent, corrosion resistant performances. The included 3-12mm adjustable drill stop collars offer versatile sizing for wood, plastic, and DIYer projects, with electroplated surfaces ensuring long lasting durability. Designed for professional contractors and DIYer enthusiasts seeking reliable depth control in woodworking tool, home renovations, or craft projects. Perfect for cabinetry, furniture assembly, or household repairs, these limiters prevent over drilling and protect materials from damage during precise drilling tasks. Optimize workshop efficiency with quick change installation and anti slip grooves, delivering secure drilling accuracy across multiple materials and drill bit sizes. Specifications: Component:carbon steel Quantity: 7 piece set Internal diameter specifications: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. Package Includes: 7Pcs Drill Bit Depth Collar Set note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.