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Last up to 2x longer than a standard HSS M3 hole saw due to 8% cobalt Electricians and plumbers find hole saws invaluable for installing pipes, electrical boxes, and recessed lighting. Ideally, they want to carry just one kind of hole saw for the challenges and materials that interior installation presents. That's why we have the PRO Multi Material. The PRO Multi Material Hole Saw has an enhanced tooth design for fast and smooth cuts and high-cobalt HSS alloy teeth for longevity. It offers effective hole sawing in steel cladding and drywall. The Q-Lock arbor helps you change hole saws and pilot drill bits faster and remove material plugs easier. For use with hole saws with thread with a cutting depth of 44 mm Tested in Bosch labs according to Bosch standard procedures. Features and Benefits: • Last up to 2x longer than a standard HSS M3 hole saw due to 8% cobalt • For use with hole saws with thread with a cutting depth of 44 mm • For cutting holes in a variety of common construction and interior materials, eg wood, drywall, GFK and metals • Highly efficient for electricians and plumbers: Long Life Specifications: Diameter mm: 20; 22; 25; 32; 35; 40; 44; 51; 60; 64; 76 Working length mm: 44