Description: 【Specification】: Inner Size 1/2inch, 7/16inch, 3/8inch, 5/16inch, 1/4inch, 7/32inch, 3/16inch, 1/8inch, and 1 Hex Wrench. 【Premium Material】: The drill stop bit collar set is made of high quality metal material, which is sturdy, wear resistant, and durable. 【Convenient and Practical】: Drilling limit rings will quickly and easily help you drill holes to exact depths and drill holes more faster and accurately. 【How to Use】: With the setscrew tight the collar, and positively lock anywhere along the bit, and will accurately control the depth of the hole you are drilling. 【Application】: Drill stop collar is great for production work, repeated drilling, and DIY enthusiast production work. Specification: Material: Metal Color: Silver Size Chart: Package Size: 15cmx10cm/5.91inchx3.94inch Package Includes: 8 Drill Bit Depth Stop Collar 1 Hex Wrench Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on line shopping!