Size: 7/8\"(22mm) 1-1/8\"(29mm) 1-3/8\"(35mm) 1-3/4\"(44mm) 2-1/8\"(54mm) 2-1/2\" (64mm) Contents: Kit includes 6 bi-metal hole saws, 1/4 in.arbor,7/16in.arbor,and arbor adapter Features: •Cut precise holes in wood, plastic, aluminum, brass, steel alloys and even stainless steel with this bi-metal hole saw set •Use for general common hand electric drill •Easy to use