Manufacturer DescriptionRAM 1.5" Ball Mount with 2.5" Round Base & 1.5" x 3" Plate for the Humminbird Helix 5 ONLYThe RAM-202-153-202U powder-coated, marine-grade aluminum Humminbird Helix 5 mount consists of a medium length double socket arm, a 2.5" diameter round base with a 1.5" C size ball, and one 1" x 2.5" rectangular plate with a 1.5" C size ball and 4-hole pattern. Rubber ball and socket technology provides shock and vibration damping, and allows for near-infinite adjustability so you can position your device at the perfect viewing angle. Compatible with versions of the Humminbird Helix 5.Compatible Devices:Humminbird Helix 5What's Included In The Box?The RAM Mount 1.5 inch Ball Screw Down Marine Mount for Humminbird Helix 5 ships with the following items included:RAM Mount Rectangular 1.5 x 3 inch Plate with 1.5 inch BallRAM Mount Standard Length Dual 1.5 inch Socket ArmRAM Mount Round Plate with 1.5 inch Ball RAM-202UFeaturesPRODUCT DIMENSIONS: Overall Height: 7.35"SOCKET-TO-SOCKET LENGTH: 4.66"HOLE PATTERN:Round Plate: 4-Hole AMPS: 1.181" x 1.496" & 3-Hole 120-Degree 1.812" DiameterRectangular Plate: 1" x 2.5"PLATE SIZETop Plate: 1.5" x 3"Bottom Plate: 2.5" DiameterBALL/SOCKET SIZE: C Size (1.5")WEIGHT CAPACITY: Standard Use: 4 lbsHeavy-Duty Use: 3 lbsMATERIALS: Marine-grade aluminumPACKAGING TYPE: Poly BagWEIGHT: 1.15 lbs