Make sure your "quick change" Arca SwissA(R) mount system is truly quick change by carrying extra BOGA(R) 4" Optic Plates with you while on the go. Simply utilize the A 1/4-20 mounting stud to put a plate on every optic & camera you have & be ready to quickly change out your gear. A 3/8-16 adapter is also included for universal fit. Mfg: Bog Gear Llc