K&M 21377 Easy Lock Distance Rod for Speaker StandSteel tube combination for use in subwoofers with M20 connection. The height is fixed with a safety hook and secured by a clamping screw for a vibration free and firm fit. The slim design of the clamp allows space saving transport and ensures a stylish appearance. The usable height is between 900 and 1,400 mm and is adjusted in 5 steps of 100 mm. The patented expanding mandrel with quick release fastener ensures a tight fit. The plastic expanding