... times;E. Dust Collector: either connected to the chaser or not;F. Life Time of Carbon brush: more ... for choosing. One is 25mm blade, the grooving depth canreach 16-25mm, while width can reach 25-28mm, it ... electric wire. The otherone is 35mm, which groove width and depth can reach 35-40mm. It is suitable ... ,this machine is suitable to brick wall or brick covered cement, not suitable to concrete.