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The Starrett KCT090501-N 14-Piece Carbide-Tipped General Purpose Hole Saw Kit includes nine hole saws in diameters from 3/4" to 2-1/2", two arbors, one pilot drill, one extension, and one ejector spring. Carbide-tipped hole saws last longer and are harder than bimetal for more abrasive materials such as wood, PVC, man-made building materials, and fiberglass. The saws have a special tooth set designed for more efficient removal of difficult-to-cut materials than bimetal hole saws. The kit comes in a plastic case with a handle.Hole saws cut holes in various materials with a drill. They are hollow cylinders made of metal with teeth on one end and an arbor hole or built-in arbor on the other end.The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company was founded in 1880 and is headquartered in Athol, MA.What's in the Box?(9) hole saws in diameters 3/4'' (19 mm), 7/8'' (22 mm), 1-1/8'' (29 mm), 1-3/8'' (35 mm), 1-1/2'' (38 mm), 1-3/4'' (44 mm ), 2'' (51 mm), 2-1/4'' (57 mm), and 2-1/2'' (64 mm)(2) arbors in sizes XA1 and XA2(1) carbide-tipped pilot bit in size XA014C(1) 12" extension, size A15(1) ejector spring, size A7(1) plastic case