Features: 1. new and high quality. Sets crew type collar will not damage bits. 2. 8 pcs Drill Bit Depth Stop Collar. Positively locks anywhere along the bit. 3. Drill Bit Depth Stop Collar. Hardened and Tempered. 4. Drill Limited ring, clamping device, positioner. High Carbon Steel Drills. 5. Works with both standard and brad?point bits. new and high quality. 8 pcs Drill Bit Depth Stop Collar. Drill Bit Depth Stop Collar. Drill Limited ring, clamping device, positioner. Works with both standard and brad-point bits. Sets crew type collar will not damage bits. Positively locks anywhere along the bit. Hardened and Tempered. High Carbon Steel Drills. Sizes:3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm Package Included: 8 x Drill Bit Depth Stop Collar 1 x Hex Wrench 1 new and high quality. Sets crew type collar will not damage bits. 28 pcs Drill Bit Depth Stop Collar. Positively locks anywhere along the bit. 3Drill Bit Depth Stop Collar. Hardened and Tempered. 4Drill Limited ring, clamping device, positioner. High Carbon Steel Drills. 5Works with both standard and brad?point bits.