The Starrett KFC06021 Electrician's Holesaw Kit contains a selection of sizes to cover a variety of different jobs. Fast Cut Bi-Metal Holesaws provide a smoother, faster cut on a wide range of materials, when compared to the previous constant pitch saw. Improved tooth material and 5.5 TPI/25mm tooth form for enhanced heat and wear resistance and greater product life. Specifically suited to cutting stainless and mild steel sheet, they will also cut through tubes with a wall thickness of up to 3mm (1/8in). Suitable for all tradesmen, installation engineers, industry generally and the DIY enthusiast. Packed in a sturdy EVA carry case. Contains: 6 x Holesaws: 16, 20, 25, 32, 40, 51mm 2 x Arbors: A1, A10