Features: Precisions engineered Drill Stop Collar Set ensures adjustable depth control for woodworking and drilling applications across 8 standard metric sizes (1/8" to 5/8"). Split rings design with carbon steel construction allows secure positioning on any drill bit while protecting tool surfaces through screw type fastening. Ideal for woodworkers, professional craftsmen, and DIY enthusiasts requiring consistent drilling depth in cabinetry, furniture assembly, and hardware installations. Essential for creating uniform holes in wood, plastic, and ceramic materials when installing dowels, mounting hinges, or performing precisions depth sensitive tasks. This comprehensive set features hardened steel collars with wrench compatibility, delivering repeatable accuracy across multiple drill bit types including twist, spades, and masonry bits. Specifications: Component: Carbon Steel Color: Black Size: 3mm/4mm/5mm/6mm/8mm/10mm/12mm/16mm Quantity: 1 set Package Includes: 8pcs 3-16mm Drill Stop Collar and 1pc Wrench note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.