K&M 21376 Distance Rod (Easy Lock)Steel tube combination for use in subwoofers with flange adapter. 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 39. 566 and 59. 251" and is adjusted in 5 steps of 3. 937". Integrated on both sides is a patented expanding mandrel with quick release fastener, which ensures a