Uxcell a15061000ux0438 8mm Woodworking Drill Bit Depth Stop Collar Ring Locator Tool (Pack of 5) Cutting Depth: 0; Overall Length: 0; Package Content: 5 x Drill Bit Stop Collar 5 x Wrench Shank Type: 0; Shank Size: 0; Cutting Diameter: 0 Material: Metal; Weight: 69g; Product Name: Drill Bit Stop Collar Color: Black; Internal Diameter: 8mm/0.3"; Thickness: 8mm/0.3" L Wrench Size: 55 x 20 x 2.5mm/2.2" x 0.8" x 0.1"(L*W*D); Collar Dia: 16mm/0.63"