Supports up to 10 lb, Ball and Clamp Design, 1/4"-20 Mounting Screw. The black ProMount 90 Articulating Wall-Mount Bracket from Definitive Technology is designed for mounting ProMonitor 1000 or Mythos Gem XL speakers weighing up to 10 lb. The bracket features a ball and clamp designed to easily direct the speaker sound in various directions. It features a 1/4-20 mounting screw and comes as a pair.