The ST-33 Standard Beam Clamp is used for forming poured concrete lintels with Masonry block walls. Meadow Burke ST-32 Standard Beam Clamp fits over 5/8″ or 1/4″ plywood form and is manufactured to form lintel beam over openings in an 8″ block wall or 12″ block wall. Meadow Burke design provides for a double 2×4 aligner beam. Made from 1-1/4″ x 1- 1/4″ x 1/8″ steel angle.