Internal bracket securely mounts any speaker cabinet with a flat bottom on an Ultimate tripod (TSM-150 1-1/2" (38 mm) tube, TSM-138 1-3/8" (35mm) tube). Universal bracket is compatible with most speakers. Diameter from outside edges is 4" (102mm) All hardware included for installation.

TSM-150K and TSM-138K glass-reinforced polycarbonate fitting holds 100 lbs. (45.5 kg) TSM-150MK and TSM-138MK metal fittings hold 150 lbs. (68.2 kg)