Item Type: Multi Chuck Material: Carbon steel Purpose: Universal chuck for electric grinder Clamping Range: Approx. 0.5-3.2mm / 0.02-0.13in Installation Thread: M8x0.75 / M7x0.75 Product Length: Short Tail: Approx. 17.5mm / 0.7in Long Tail: Approx. 23.0mm / 0.9in1The multi chuck possesses high accuracy and good coaxiality, easuring stable work. 2Made of high?quality carbon steel, the multi chuck possesses long service life, high hardness and guaranteed quality. 3With professional design and reasonable structure, the product is easy to disassemble and assemble and effort?saving. 4The range of the chuck is 0. 5?3. 2mm, which can be used on electric grinders and electric drills after being clamped by connecting rods. 5The product is an universal chuck for electric grinder with the short tail of about 17. 5mm and th elong tail of about 23mm. 1 x Chuck