I needed to drill through an 8" wall with a Milwaukee SDS plus. The center cap isn't very good, and the set screw fell out and disappeared almost immediately. The drill couldn't do more than scratch the surface, so I drilled 8 1/2" holes around the circle to get started and remove some material. This bit then chewed through 8 inches of concrete in about 15 minutes. A tooth is It saved me $175 in rent so it was worth it but it's not really made for concrete Should work better in cinder blocks or plan on drilling a few pilot holes to make the task easier.