Excalibur Sheet Metal Cutting Head Kit 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 loads Cuts mild steel up to 1.6mm (16 gauge, 0.060") Cuts stainless steel up to 1.2mm (18 gauge, 0.050") Cuts aluminium & copper to 2.0mm (14 gauge, 0.080") Cuts at up to 300mm (1 foot) per second One hand operation Curves and straight Can be rotated 360 degrees on motor for the most comfortable operating use Interchangeable with Excalibur Fibre Cement Shear head