Features [Fine workmanship] The holes of the hole opener adapter are neat, smooth, without folds, and without tremor. [Easy to decorate] It is easy to decorate after slotting and removing chips. [Scope of application] This tungsten steel water chuck adapter is suitable for drilling machines (benchs drills) and pistols drills, and then use a hole opener. [Efficient and fast] Small incision resistance increases the opening speeds. [Easy to install] Easy to install and unload, because at the joint between the water head and the water pipe, water can enter from the hole opener (drill bit), and the slag generated in the hole can be easily discharged under the water pressure, thereby reducing the broken friend. Specification: Item Type: Water Nozzle Drill ChuckMaterial: Tungsten Steel Weight: 6x6 (164g) 6x10 (189g) Size: Approx. 10 x 4 x 4cm / 3.9 x 1.6 x 1.6in Package List: 1 x Water Nozzle Drill Chuck Package List 1 x Water Nozzle Drill Chuck