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 stone, lightweight concrete, mortar, tiles, drywall Max. cutting depth: 25mm Adaptor thread diameter: 9.7mm / 13.6mm Centre drill length (including adaptor): 88 / 89mm 9 piece set: 6 hole saws, 2 centre drills with adaptor, 1 hex key