? Product Description HG type Hole Saw are multipurpose .They can easily perforate all metallic plates with an electric drill or be used with pillar drilling machine to cut angled steel,square pipe,stainless steel pipe,channel steel,etc. ? Feature This type Hole Saw can easily and quickly perforate pipes and hard material up to 5mm thickness with its extremly sharp Tungsten carbide cutting edges.This Hole Saw can be run at high feed rate and speed to creat holes for exceptional qualty and accuracy The slug is spring eject when cutting is finished This type of Hole Saw can be used on portable and pillar drilling machine