Check the listing for details. On-Stage LSA7700P u-mount Lighting Arms (2-pack) Bundle. Condition: New. Listed at 123.90 USD. Quickly and easily add more lights to your current stands with the On-Stage Stands LSA7700P u-mount Lighting Stand Accessory Arms. These extension arms let you add lighting fixtures to almost any lighting or speaker stand in minutes. The universal design of this u-mount accessory lets you add lights to stands with a 1-1/2" or 1-3/8" tubing. Adding extra lights to your rig without having to buy extra more is something we at Sweetwater know most DJs and musicians will appreciate. The LSA7700P is constructed of 4mm thick aluminum with a 2" diameter. Each arm will support up to three light fixtures. A rugged powder coat finish will keep the LSA7700P looking good for years. Expand your current lighting stands or add lights to your speaker stands with the On-Stage Stands LSA7700P u-mount Lighting Stand Accessory Arms.