Double open end bonds speed up the laying process because they can be positioned around vertical rebar and accept horizontal rebar in the notch. Concrete masonry provides a cost effective answer to a variety of essential building needs including structure, fire separation, architectural finish, sound control, and low maintenance. Concrete block made to industry specifications are a reliable durable material that may be used to construct economical walls. Their smooth texture provides a finished surface or if you choose can be painted to suit the need. Concrete block are the designers choice for many wall applications.