Manfrotto 323 Quick Change Rectangular Plate Adapter, quick release adapter with universal thread; Adds quick release feature to your monopod; Adapter allows quick assembly and disassembly of equipment; 6.3 mm and 9.5 mm universal threads for maximum compatibility; 200PL quick release plate is included; Material: aluminum; Dimensions (LxWxH): 52 x 74 x 23 mm; Weight 170 g