Keystone Hardscapes 77121 Broadstone® 8" RockFace Retaining Wall System Earth Blend. The BroadStone series minimizes retaining wall installation costs while maximizing structural performance and aesthetics. Labor is reduced by drop-and-click placement, plumb-line core filling, and connectorless installation. Material is reduced by maximizing core-filled volume, eliminating connectors, and increasing coverage per truckload. BroadStone delivers these advantages across a full line of block heights and face styles, including multi-piece and ashlar options that install at single-piece speed.