Widely Used: HSS Hole Saw Kit is able to cut round holes in stainless steel, mild steel, iron, aluminum plate, alloy plate, plastic sheet, copper, brass etc. Special Design: This hole cutter set applies spring center design. It can control the amount of feed and helps to remove chips, avoiding damage to the drill bits Wide Application: Our hole saw set is suitable for hand-held electric drill, vertical electric drill and mobile belt magnetic drill. Product Name: Hole Opener Material: High Speed Steel Application: For opening holes of stainless steel round tubes and aluminum round tubes Scope of Application: Steel plate / iron plate / stainless steel / Other thick materials Features: High speed steel material, durable and practical. Perfect for installing locks, knobs in doors and cabinets or drilling larger diameter holes through desks, etc. Cuts steel, stainless steel, copper, brass, aluminum, fiberglass, formica and more laminates in seconds. Application for thin metal, iron plate,