Drill Stop Bit Collar Set: 8 stop collar sizes of 1/8 inch, 1/4 inch, 7/32 inch, 5/16 inch, 3/8 inch, 7/16 inch, and 1/2 inch for the most common drill bit sizes, suitable for various DIY projects. Compatible with twist drill bits, brad point drills, and other standard drill bits. Precise and Efficient: Once secured on the drill bit, the stop ring remains fixed, enabling quick and consistent drilling to a uniform depth. Eliminates the need for repeated measurements or over-drilling. No more tape wrapping—achieve greater accuracy and save time. Durable Material: Made from high-quality carbon steel for long-lasting performance. Surface treated with anti-rust oil for enhanced corrosion resistance. The screw-type design securely holds without damaging the drill bit. Easy to Use: Each stop ring features a locking screw for secure positioning at any depth. Includes a hex wrench for easy tightening and quick adjustments, allowing precise control over drilling depth. Material: Steel Color: Black Package Contents: 1 set x Drill Stop Bit Collar Set Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.