Review on Spyder 600038 Rapid Eject 3 5 Inch: Effortless Quick Release at its Finest by Juan Wilson

This crown worked perfectly. I used it to pierce both the cement wall and cement foundation when installing the radon fan. The bit worked great and is still good enough to do more. I bought two, expecting to need one drill bit per rebar hole, but ended up only needing one. I would buy again if I didn't already have extra.