hole saw set. 8pcs We can do any size as you need. hole saw set.8pcshole saw: 15,18,43,67mmmaterial :65Mn-steelMaterial thickness:1.2mmHardness:87-90HRCTeeth with carbide powdering1adaptor length 45mm for hole saw 15&18mm1adaptor length 67mm for hole saw 43mm and up1centre drill(hard metal/YG8) for adaptors 43&67mm, length:80mm,diameter of shaft:6mm, drill diameter: 8mm, sandblasted