Thumbscrew used for a variety of applications, including Buescher, Bundy and Selmer saxophone necks, Bach FH200 and 183 flugelhorn leadpipes, Bach 196 piccolo trumpet leadpipes, Bach B185 triumphal trumpet bells, Bach 36C and 42C series trombone bell attachment points, and Bach removeable trombone leadpipes. 8x32 thread. 26mm overall length.