This complete Hole Saw Kit features HSS bi-metal hole saws in 11 sizes. Set includes: 3/4 inch, 7/8 inch, 1 inch, 1-1/4 inch, 1-3/8 inch, 1-1/2 inch, 1-3/4 inch, 2 inch, 2-1/2 inch, 2-5/8 inch, and 3 inch bi-metal hole saws, 1/2 inch x 20 UNF arbor, 5/8 x 18 UNF arbor, 12 inch extension, and a high impact plastic case. Arbors and extension have hex shanks for a no-slip grip.