Mainly, this applies to softer materials. A lighter and steady tension is ample. It lets the enamel to chop efficiently without the improved probability of clogging. Suited to use on aluminium, cast iron, plastics, metal & wood 35mm most reducing depth To be used with the arbor for chopping 48mm https://juliusjwlao.blogs100.com/35974398/5-essential-elements-for-hss-hole-saw