Review on Powerful Blair BLR11091 Diameter Broach Rotabroach - Ultimate Cutting Efficiency by Andres Black

Excellent tool for quickly cutting holes in steel. The only problem with this and other rotary power cutters is that after the tool has been used, the heat and pressure of the process causes the cutter to be very tight against the mandrel. You then need to use a vise to loosen the cutter. Well, they crack if you squeeze them too hard. The cutters require flat surfaces to seat the mandrel wrench.