Review on Bosch Spline Speed X Rotary HC4031 by Charlie Dillon

Bosch slotted drill bits are really well made and strong enough for the most demanding applications. We used this drill bit to install 3/4 deep wall studs in 18" reinforced concrete walls with consistently positive results. I've been working with these beats for ten years and have only broken one in that time. Pay attention to the dimensions, as the total length given is not entirely usable.