1. EASY DRILLING IN DIFFERENT SIZES: With 8 precision drill stop rings in various sizes, you can effortlessly tackle any drilling project. The included rings and Allen key allow for quick, accurate depth adjustment and secure stop ring placement. Package includes: 8 x drill depth stop rings 1 x Allen key. 2. STANDARD: These depth stop rings are crafted from carbon steel, ensuring durability even under frequent use. They provide the ideal material solution for all your drilling needs. 3. WORKMANSHIP: Simply tighten the set screw on the selfcentering drill guide stop ring using the Allen key for flawless depth control. No more uneven drilling depths—easily repeat tasks at consistent heights. 4. ENHANCED DRILL CONTROL: Achieve precise depth measurements with our selfcentering drill guide stop set, making accurate drilling simpler. Prevent surface burns, reduce errors and waste, and drill more efficiently.