From Parkside.
Suitable for all standard power drills and cordless drills In a practical storage case Hole saw material thickness: 1.2mm Ideal for cutting aluminium, copper, bronze, zinc, tin plate, wood, PVC and acrylic Max. cutting depth: 38mm Hole saw diameter: 19 / 25 / 38 / 44 / 68 / 83mm 2-way adaptor thread diameter: 12.2 / 15.3mm Centre drill length: 75 / 104mm 9 piece set: 6 hole saws, 2 centre drills, 1 two-way adaptor