The JS SP50 is exactly what you need for your subwoofer/satellite speaker PA system. It's adjustable in height from 31.5 - 52.5 in. and mounts between a subwoofer cabinet with a top mounting hole and a speaker with a bottom mounting hole 1.375 in.for both. The JS SP50 features both a friction locking knob and a security pin system and is made from durable steel.FeaturesHeavy-duty construction, Height adjustable from 31.5 - 52.5 in.Friction locking knob with security pin1.375 in. upper and lower tubes.Height: 31.5 - 52.5 in.800mm -1334mm Upper Tube Size: 1.375 in. (35mm)Lower Tube Size: 1.375 in. (35mm) Weight Rating: 110 lbs. (50 kg)Weight: 3 lbs. (1.4 kg).
