Description:_x000D_ This practical woodworking tool helps to give you consistent control of drilling depths easily. The kit including 8 depth stop collars to meet various demand: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm(inner diameter). It is made of high carbon steel, with high hardness and strong strength, easy to operate._x000D_ _x000D_ Features:_x000D_ _x000D_ High carbon steel features high hardness, strong strength and long durability. _x000D_ 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm and 16mm drill depth stops will fit drill bits in different size. _x000D_ Help to limit the depth of drilling hole as you want. _x000D_ Equipped with a hex wrench for convenient use. _x000D_ Easy to use, just insert the stop collar on the drill bit to to the desired depth and tighten by wrench. _x000D_ _x000D_ Specifications:_x000D_ Condition: 100% Brand New_x000D_ Material: High Carbon Steel_x000D_ Color: Black_x000D_ Inner Diameter: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm_x000D_ Outer Diameter: 10mm, 11mm, 12mm, 13mm, 16mm, 17mm, 19mm, 22mm_x000D_ Weight: approx. 64g_x000D_ _x000D_ Package Included:_x000D_ 1 x 8pcs/set Depth Stop Collar_x000D_ 1 x Hex Wrentch 1High carbon steel features high hardness, strong strength and long durability 23mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm and 16mm drill depth stops will fit drill bits in different size 3Help to limit the depth of drilling hole as you want. 4Equipped with a hex wrench for convenient use 5Easy to use, just insert the stop collar on the drill bit to to the desired depth and tighten by wrench