Aggressive material penetration and swarf clearance, removing the need to carry a constant and variable pitch Hole Saw. Constructed of hardened steel and abrasion resisting high speed steel teeth with a tough alloy body and cap. The complete Multi-Purpose Saw. Cutting depth of 51 mm (2”). Starrett designed Tooth geometry resulting in huge improvements in chip flow.
I used this to drill holes in 1/8" thick metal and couldn't finish the second hole. I used the second one and the same thing happened so I recommend buying the more expensive one. and yes, I kept the tool cool and kept the RPM low to avoid overheating the tool.