8 SIZES FOR VERSTILE DRILLING: This set includes 8 precision drilling depth stop rings in varying sizes. The rings, together with the included Hex Wrench, let you quickly and accurately adjust and secure the drilling depth. Package includes 8 drill depth stop rings and 1 Hex Wrench. HIGH STANDARD CARBON STEEL CONSTRUCTION: Stop rings are forged from high quality carbon steel for durability and reliability; designed to withstand regular use without breaking. EXCELLENT WORKMANSHIP: Use the included Allen wrench to tighten the set screw on the self-centering drill guide depth stop ring for precise depth control. This enables repeatable hole depth across multiple drilling operations. ENHANCED DRILLING CONTROL: The self-centering drill guide depth stop ring provides accurate depth measurement, helping prevent surface burning, reduce errors and waste, and improve drilling efficiency. USE SCENARIOS: - Woodworking: drill holes to exact depths for screws or dowels. - Metal or plastic work: achieve consistent depths for through or blind holes. - DIY cabinetry or furniture making: repeatable hole depths for uniform fittings.