Sizing Variety: The set features 12 distinct hole saw blades. The sizes are clearly printed on the box in both inches and millimeters:Smallest: 3/4" (19mm)Largest: 5" (127mm)Intermediate sizes: 7/8" (22mm), 1 1/8" (29mm), 1 1/4" (32mm), 1 1/2" (38mm), 1 3/4" (44mm), 2" (51mm), 2 1/2" (64mm), 3" (76mm), 3 1/2" (89mm), and 4" (102mm).