8pcs/lot woodworking drill bit depth scollars ring positioner drill locator

features:brand new and 8-pc drill bit depth scollar.drill bit depth scollar.drill limited ring, clamping device, positioner.works with both standard and brad-point bits.setscrew type collar will not damage bits.positively locks anywhere along the bit.hardened and tampered.high carbon steel drills.sizes:3mm 4mm 5mm 6mm 8mm 10mm 12mm 16mm.