Rotary burrs, HSS|High speed steel burrs are used primarily for machining soft steel, aluminium, bronze, brass, etc|High speed steel burrs are a better choice when optimal machining conditions cannot be maintained or, when the risk of vibration and impact shock are high|Also usable with low cutting speeds|Type of cut:M: Medium, for machining unhardened steel and other moderately hard materials under normal conditionsEC: Extra coarse, for soft materials when good stock removal is required. Counteracts chip build-up between teeth|Packaging: Plastic box – Individually packed in boxes of 5