Review on 🔩 Bosch HC4091 Spline Speed X Rotary Drill Bit by David Silva

I bought this product primarily to drill and remove blue stones/boulders from my property. I used Dexpan, a non-explosive demolition tool, to break the rocks into pieces. First I drill no more than 8 inches from the desired crack path through the boulder. Then mix Dexpan with water according to the instructions, then pour into the boreholes. After continuously drilling 3-4 holes, the carbide tip came off. I don't think this product is suitable for rock drilling. I have returned the item and bought a Dewalt hope this helps.