This 7-piece set is ideal if you want to prepare electrical installations and drill in soft and medium-hard wood, insulation boards, drywall, plastic or metal. It contains 6 hole saw inserts made of bi-metal with Ø 40, 54, 65, 68, 74 and 86 mm, a mandrel with 5/8" thread and a centre drill (Ø 6 mm) made of high-performance high-speed steel. This enables you to drill accurately fitting holes with a cutting depth of 55 mm. The special alloy tool body with HSS toothing ensures a long service life and smooth running. The hexagonal shank (Ø 11 mm) allows the hole saw inserts to be quickly locked in the chuck of your drill or cordless screwdriver. You receive the set in a high-quality 2-component 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.