The block in the picture look lkie knock-out block. The reliefs are cast into the center webs so they can be hammered out easily for use as a bond beam. You wont be able to cut dep enough with a grinder in the center webs, so I would recommend getting the right block from a masonry supplier. You could rent a 14" concrete saw to saw deep enough, but you're probably farther ahead just buying the right block.
Rebar Channel
I am using this type of block and need to create a channel for horizontal rebar. What tools and method could I use to create a channel similar to the one pictured? Thanks, Jim.
