This ID Series Speaker Sub Pole features piston-driven height adjustment and an adapter for traditional mount or M20 threaded mount. Adjustable from 37 to 57 inches, it is meant for use ideally with cabs between 35-40 pounds, but can handle up to 125 pounds. This ID Series Speaker Sub Pole works great with the JBL VRX915S, VRX918S, SRX718S, PRX615S-XLF, PRX718XLF, PRX400, PRX600, PRX700, STX800, VRX900 and QSC KW181, KSUB, KLA181 speakers.