The description of 11 PC High Carbon Steel Hole Saw set:

• Can be used in portable electric or pneumatic tools, vertical drillmachines, and other machine tools.
• For cutting in wood, PVC, plywood, plastics, wall board and soft metals
• Heat Treated Carbon Steel and handened teeth for safety and Durability
• The set includes 3/4"(19mm), 7/8"(22mm), 1"(25mm), 1-1/8"(28mm), 1-1/4"(32mm), 1-3/4"(44mm), 2"(51mm), 2-1/2"(64mm) High Carbon Steel Hole Saws, 2PC Matching Arbors, and 1PC Hex Key Wrench .
• Cutting depth: 28.5mm
• All the drilling holes and cutting areas are smooth and flat with no burr ,and the degree of being straight and curve is perfect.