IRWIN 10506441 9 PIECE BIMETAL HOLESAW KIT Irwin 9 piece bimetal holesaw kit Sharp variable tooth 46 pitch design for pa faster cutting action Enhanced performance in a variety of materials & cutting applications Designed for professionals Made to provide long lasting performance Bimetal construction and pwelded teeth give the user a stronger longer lasting blade Cuts a variety of materials including Aluminium Copper Iron Stainless Steel Wood Zinc p