| Material: Carbon Steel Inner Diameter: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm Mainly for bit attachment, limit drill depth, make hole depth consistent. Works with standard bits and drill bits Collar type threaded shank will not damage bits Product Description About the drill bit warehouse: general tools and instruments bit limit ring Specifications: Name: Chuck and Hex Wrench Material: Carbon Steel Surface: Black Finish Specification: 3,4,5 ,6,8,10,12, 16mm role of limit ring: Mainly for fixing the drill bit, limit the drilling depth, make the hole depth consistent.More convenient to use round wood mortise. What you get: 8 x Chuck 1 x Hex Wrench | |