The Starrett KFC07021 Plumber'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 7 x Holesaws 19, 22, 29, 38, 44, 51, 57mm 2 x Arbors A1, A10