The MA-X series adapter is designed to securely attach a Leofoto New Release Outdoors Head to a tripod with a 75mm/100mm bowl. The MA-75X is for the standard top plate of 75mm tripod systems, and the MA-100X is for the standard top plate of 100mm tripod systems. The adapter connects the head securely using a Rosette Connector and a set screw, ensuring stability during shooting. It is compatible exclusively with the following "X" version Leofoto outdoors heads: MA-40X, MG-40X, MK-40X, MH-35X, MH-40X, MH-50X, and MH-60X.(not compatible with earlier versions of these heads.) The MA-75X is compatible with Leofoto 75mm systematic tripods including:LM-32xCXLM-36xCXLM-403CXLN-364CSO-322CXSO-362CX The MA-100X is compatible with Leofoto 100mm systematic tripods including:LN-404C