Dremel Mandrel 401 Mandrels are used to mount different accessories to use with your Dremel rotary tool. The 401 Dremel Mandrel features a 1/8 In. (3.2 mm) shank with a screw-like head used primarily to hold soft and pliable accessories like polishing bits. The accessories can be threaded onto the mandrel simply by screwing the accessory into place. The 401 Mandrel can be used with the 414, 422 and 429 cleaning and polishing accessories. Features & Benefits Used primarily with polishing bits and accessories including the 414, 422 and 429 Dremel accessories Head size is 1/2 In. diameter High quality component Works with many accessories Specifications Color / Finish: Silver Mandrel Head Type: Threaded Diameter (in): 0.225 Material: High Speed Steel Overall Length in: 1.5 Shank Diameter in: 0.125 Contents: 1 Bit