Detailed Product Description 16pcs Hole Saw SetMaterial: Bi-MetalFinish: Plastic PowderIncluding:13pcs Hole Saws: 3/4"(19mm), 25/32"(20mm), 7/8"(22mm), 1"(25mm), 1-1/8"(29mm), 1-1/4"(32mm) 1-3/8"(35mm), 1-1/2"(38"), 1-3/4"(44mm) 2"(51mm), 2-1/4"(57mm), 2-5/8"(67mm) 3"(76mm)2pcs Arbor: 3/8" Hex Shank (Fit 14-30mm) 7/16" Hex Shank (Fit32-210mm)1pc Extension: 12" for 7/16" Shank