Features:1. Widely used to cut holes in a variety of material like Wood， Plastic， PVC Sheet， Insulation Boards， Thin Iron， Copper， Aluminum Alloy， Steel，etc.2. Ideal For DIY， Home and General Building/Engineering Using3. High speed steel，Durable.Specification:Material: High Speed SteelSurface : Titanium CoatedContaining sizes: 16mm，18.5mm，20mm，25mm，30mmQuantity: 1 Set (5Pcs)Package included :1 x 16mm HSS Hole Saw1 x 18.5mm HSS Hole Saw1 x 20mm HSS Hole Saw1 x 25mm HSS Hole Saw1 x 30mm HSS Hole Saw5 x Wrenches