Klein Tools 31630 8-Piece Hole Saw Kit Contains the most popular sizes for basic electrical work Saw diameters are 7/8-Inch (22 mm), 1-1/8-Inch (29 mm), 1-3/8-Inch (35 mm), 1-3/4-Inch (44 mm), 2-Inch (51 mm), and 2-1/2-Inch (64 mm) Also includes 2 arbors (Cat. Nos. 31660 and 31670) All components are packed in a rust-proof, molded plastic carrying case Note: Set pilot drill point 1/8-Inch beyond tooth points. Read and follow safety instructions in power tool owner's manual.