RAM Composite Drill-Down Mount for Delorme Earthmate PN Series (RAP-B-138-DEL1) (sku 54769)The RAP B 138 DEL1 consists of a double socket arm, 2. 5" diameter round base with the universal AMPs hole pattern, diamond adapter base and custom high strength composite cradle for the Delorme Earthmate. Designed into the mount is a 1" diameter patented rubber ball and socket system with adjustment points at the base and cradle. With a twist of the arm knob, you can move the flat surface Delorme Earthmate mount to your optimum viewing position.