The RAM-B-174-DEL1 consists of a double socket arm, hardware for mounting to both brake/clutch reservoirs and rails that are 0.5″ to 1.25″ in diameter, 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 Delorme Earthmate motorcycle mount to your optimum viewing position. The mounting hardware for brake/clutch reservoirs include both standard and metric mounting bolts. This mount is designed to hold the following devices: Delorme Earthmate PN-20 Delorme Earthmate PN-30 Delorme Earthmate PN-40 Delorme Earthmate PN-60 Delorme Earthmate PN-60w SEIncluded with Purchase: (1 qty) High strength composite cradle (1 qty) Base/ball adaptor (attaches directly to cradle) (1 qty) Standard size double socket arm (1 qty) Mounting base (mounts to either brake/clutch reservoir or rail/handlebar) Hardware for mounting to either brake/clutch reservoir or rail/handlebar Material: High Strength Composite and Powder Coated Marine Grade AluminumBall Size: 1″ Rubber Ball „B” Size Note: Part number reflects product packaged in clear clam shell for store shelf display. To see if the RAM-B-174-DEL1 base will mount to your motorcycle, check the hole spacing of the base against your clutch/brake reservoir. The holes centers have a minimum width of 0.94″ and a maximum of 1.58″. Related Links:Delorme Earthmate PN-60 New Products PageRAM GPS Mounts PageBrake/Clutch Reservoir Base Assembly Instructions.