Review on 🔩 Bosch HC4091 Spline Speed X Rotary Drill Bit by Chase Hosea

Bought the latest Bosch hammer drill/drill at half price. Didn't know if this new star holder end would work with this old tool model. It works and works just as well as the old hex end receiver bits. Used to drill holes in an old foundation to showcase it from an expensive engine. The older boys couldn't believe I didn't need a jackhammer. Attention: During drilling, occasionally lift the hammer to remove the dust from the hole, otherwise the drill will get stuck. You may need a second drill and leave the stuck drill in the hole until the next morning when the expensive grout cracks the concrete or whatever you're drilling. If you use young helpers, they won't do as you tell them until they get into trouble, and maybe even after.