This 4-piece set is ideal if you are renovating a house or flat and want to drill into soft and medium-hard wood, insulation boards, drywall, plastic and metal. It contains 3 hole saw inserts made of bi-metal in diameters of 35, 43 and 68 mm, a mandrel with an 11-Ø mm hexagonal shank 5/8" thread and a centre drill bit (Ø 6 mm) made of high-speed steel (HSS). This allows you to achieve precise holes with a cutting depth of 40 mm. The hexagonal shank allows the hole saw inserts to be quickly locked in the chuck of your drill or cordless screwdriver. You receive the set in a plastic box in which you can transport the parts safely and store them neatly. The hole saw inserts are TÜV-tested - so you can rely on safe quality products.