The TF-001-30B is a professional wrap-around medium-duty clamp and is ideal for all general light and effect rigging applications. This clamp is compatible with almost all 2" inch diameter truss and is designed for mounting your lighting fixtures and effects weighing up to 660 lbs (300 kg). Ideal for obile DJs, light riggers, and theater stagehands.This clamp also has an M10 wing-nut accessory bolt for an even more secure installation.