Lightweight stud support Made from engineered polymers so they are lighter than aluminum backer plates yet still offer excellent support strength Available in three styles: Super Lite Double Backer for standard studs, Super Lite +PLUS Backer (single) and Super Lite +PLUS Double Backer Super Lite +PLUS single backer is a larger 1.450" square backer to be used on all 5/16" studs to offer outstanding support Super Lite Double Backer is not for use with single-ply tracks or Power Point +PLUS studs with larger diameter heads For 5/16"-24 threads Super Lite Double backer plates measure 1.280" x 2.250" (1" hole distance) Super Lite +PLUS single backer plates measure 1.450" square Super Lite +PLUS double backer plates measure 1.450" x 2.610" (1.160" hole distance)