Goalsetter Wall Mounted Height Adjustable Basketball System External Compression Height Adjustment Mechanism allows rim height to raise and lower 6' to 10' (GS48 only adjusts 7 to 10) Backboard is 42" x 72" and made of 3/8" Acrylic mounted on an exclusive H-Frame design made of 1-1/2" structural steel tubing to provide precise and consistent ball response Corrosion-Resistant paint process of one primer coat and two coats of baked on acrylic-enamel provides a high-gloss finish 3 ft Extension from wall to front of backboard. GS48 has narrow extension arms and only adjusts 7" to 10" GS72, GS60, and GS54 have wide extension arms and adjust 6" to 10"