Protect the riflescope objective lens from rain and sunglare with an Alumina lens shade. These shades can be threaded one to another to create custom lengths. The 40mm Alumina lens shade will fit Leupold riflscopes with 40mm objectives manufactured after 2004, including VX-I, VX-II, VX-III, VX-1, VX-2, VX-3, VX-R, and all Mark 4 40mm objective scopes.