Replacement knob for K&M (and other brand) instrument and music stands. Metric M6 thread x 16mm in length. This knob is a replacement for those used to secure the bell cup and main shaft on K&M trombone stands models 14985 (our 030080), 14990 (our 074516), and 452/14991 (032216 "UMI/Conn-Selmer"). Also used to secure the folding leg assembly on models 14990 and 452/14991.