ROUGH TCT HOLE SAW This hole is for cutting various wood, chip board,plasterboard, brick, normal hardness ... base and carbide tipped pilot drill in kits.Max cutting depth is 50mmOuter DiameterOverall LengthMetric(mm)Inch(inches)331 ... 83mm with hex screwAl Alloy Base to fit hole saw 33,43,53,63,67,73,83mm with hex ... screwAl Alloy Base to fit hole saw 73,83,93,103,113mm with hex screwAl Alloy ...