Review on Irwin Tools 5026015 Spiral Masonry by Nick Moody

Fits well in cartridge and gnaws through concrete; However, the bit regularly slips when in contact with hard concrete, causing the chuck to shear off part of it. My 3/8" shank eventually approached the 1/4" shank, even with religious tugging. I'm sure the bit would last a long time if I used it on lighter surfaces like brick or cinder block or if I didn't have to drill that deep. Not bad overall, but a standard drill press is probably not the best tool for heavy-duty masonry drilling.