Fits most power drills but best purchased factory fitted and tested with two-year warranty on the complete unit- available factory fitted on mains (240 Volt), cordless (14.4 Volt battery) and air motors- suitable drills include the following features - 43mm diameter neck, 15mm long - 3/8" or 1/2" UNF shaft - capable of accepting substantial shaft side loadsCuts up to -9mm (3/8") non compressed fibre cement sheet-6mm (1/4") compressed fibre sheet-16mm (5/8") plaster boardMinimum dustCurves and straightOne handed operationCan be rotated 360 degrees on motor for the most comfortable operating useInterchangeable withExcalibur Sheet Metal Cutter head.