7pc Bi-Metal HSS Hole Saw Power Drill Bit Set is made of High Speed Steel includes 5pc bi-metal Hole Saw, 1pc Pilot Drill & adap 7pc Bi-Metal HSS Hole Saw Power Drill Bit SetMaterial: Bi-MetalContains:5pc Bi-Metal Hole Saw: 1-1/2"(38mm), 1-3/4"(44mm), 2"(51mm), 2-1/4"(57mm), 2-1/2"(64mm)1pc Pilot Drill1pc AdapterPacked with blow mold case 7pc Bi-Metal HSS Hole Saw Power Drill Bit Set