Specifications: Practical drill bit depth fixed ring. 8 pcs in 1 set with hex wrench Useful positioner for woodworking. Works with both standard and brad-point bits. Type: Fixed Ring Quantity: 8 Pcs in 1 Set Material: High Carbon Steel Features: Locator Ring Easy to Use Drill Bit Depth Stop Collars Size: 3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm/0.12 0.16 0.20 0.24 0.31 0.39 0.47 0.63 (Approx.) Notes: Due to the light and screen setting difference the item s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 8 x Drill Bit Fixed Rings 1 x Hex Wrench