The ENGINEER TR-11 Taper Reamer bit is ideal for enlarging (opening out) and chamfering holes in aluminium, thin steel plate & similar metals. It's also perfect for pipe deburring. The bit has a standard 6.35mm (¼") hexagonal shaft so it can be used with compatible T-Handles (not supplied) or other compatible handles/grips. The reamer bit comes with a tommy bar for hand operation, but the reamer bit can also be used with a cordless drill with a 3-jaw chuck (not compatible with impact driver chucks). Constructed from carbon steel (hardness HRC55-58). Made in Japan.