GUNDLACH NO. 20 L-SHAPED ALUMINUN STRAIGHT EDGEUsed as mortar screeds For ceramic tile installation work, the angle type construction of this tool makes it strong and rigid. Unlike wood, it cannot warp or rot, and will maintain its original straightness. This clear anodized aluminum is extremely lightweight and cannot rust. Easy to handle, individual straight edges nest for compact storage. When stored, the entire set is held together by a screw and wing nut. Set consists of five lengths as