The kirk mpa 2 monopod head was designed and built in the usa and is constructed from tough 6061 t aircraft aluminium including the solid captive design knobs and the internal metal parts are stainless steel to avoid corrosion the bearings are made from self lubricating delrin composite and the tripod socket accepts 38 inch thread the kirk mpa 2 features kirks 25 inch arca style quick release bodylens clamp so you can upgrade your system to quick release immediately the mpa 2 has robu