The SC-30 is a must-have and is ideal for all general light and effect rigging applications. This medium-duty wrap-around clamp makes hanging your lighting fixtures and effects a simple task. This clamp is also compatible with almost all 2" inch diameter trusses and is designed for mounting your lighting fixtures and effects weighing up to 660 lbs (300 kg). I deal for obile DJs, light riggers, and theater stagehands.