Ultra SC54 Holesaw 54mm ULTSC54 These holesaws give safety, performance and cutting precision. They are for use in portable electric tools. They are hard enough to cut most materials used in mechanical workshops, shipbuilding, general maintenance etc - including metal and plastic tanks.Features include:- HSS teeth beam welded onto a softer steel backing.- Very hard tooth tips (Rockwell 63).- Variable tooth pitch around the blade from 4 to 6 tpi for faster cutting.- A thicker base plate, reducing vibration and allowing greater torques to be applied without distortion.Maximum cutting depth: 34 mm.Diameter: 54 mm. ULTSC54