The Proline tripod speaker stand features a center steel shaft for maximum support and an aluminum body for lighter weight. Locking pins are included for extra safety. 150-lb. capacity. Fits 1.375" or 1.5" speaker mounts. Height adjusts from 45"-73".Tripod speaker stand Center steel shaft Aluminum body Locking pins 150-lb. capacity Fits 1.375" or 1.5" speaker mounts 45"-73" height