Bolt PP-MCX Mounting Clamp for Small Lights & Portable Power Pack Clamp Opens from 0.1 to 1.8" * Holds 2 lb on Stands / 8 lb on Flat Base One 3/8"-16 & Two 1/4"-20 Threads * Belt Clip Slot for Power Pack Rubber Coating to Prevent Damage Limited 1-Year Warranty