I mostly try to use my hole saws for wood aluminum or steel less than 1/4" thick. My frill press is hard to change speeds so I leave it on the lowest but that is still 325 RPM. too fast for the 3 1/2 to 5 " saws I have for anything other than softer materials.I have a 3/4" hand drill with 2 speeds 155 RPM low 375 high there abouts It works good but hard to control that leaves the mill it is 3 Hp but also belt drive so again PITA to change speeds. My annulars only go up to 1" Some day I would like to increase my selection of them up to 2" 1/16" or 1/32" I'd like to have 2" depth cutters but I have to buy things like this 1 at a time as pricey as they are.