m0.5 hob cutter.The material is HSSIt is old stock, it has some stains from dried oil.Never used, Excellent condition.Weight : 24grModule: 0.5Arbor mount: Φ10x16mmkeyway:-Width: 10mmExternal cutting diameter ( largest ) : 25mmTeeth on each rotation : 10 cuts / rotationTeeth on width ( axis ) 7teeth width Sharp, ready to cut.Returns accepted.