10pcs are all the same size, please choose the size you want. Description: 10pcs 3\/4\/5\/6\/8\/10mm Woodworking Drill Chuck Depth Stop Collar Set With Hex Wrench Specification: Name: Drill Chuck & Hex Wrench Material: Carbon Steel Surface: Black Hex shank: 2.5mm(W) Stop Collar Sizes: 1\/8" (3mm), 3\/16" (4mm), 1\/4" (5mm), 5\/16" (6mm), 3\/8" (8mm), 7\/16" (10mm) Quantity: 10pcs x Drill Bit Depth Stop Collar(notice: without drill bit) 1 x Wrench Features: 10pcs Drill Bit Depth Stop Collar. 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. Limit ring Role: Mainly for fixing the drill bit, limited the depth of drill holes, make depth of the hole consistent. More convenient to roundwood mortise Of Use. Package Included: 1 pc x hex shank 10 pcs x Stop Collars More Details: