The RAM® Rectangular Ball Base combines a C Size 1.5" rubber ball with a 2" x 4" mounting plate featuring a four-hole pattern spaced 1.5" x 3.5" center to center. It provides a sturdy connection between compatible marine electronics or equipment and a RAM® C Size mounting system. The powder-coated, marine-grade aluminum plate is built for demanding environments and fits devices with a matching hole pattern, including the Humminbird HELIX 7. The integrated rubber ball allows adjustable positioning when paired with a compatible RAM® C Size socket arm. Key Features 2" x 4" rectangular plate with a four-hole mounting pattern Mounting holes spaced 1.5" x 3.5" center to center Integrated C Size 1.5" RAM® rubber ball Compatible with a variety of RAM® C Size socket arms and mounting components Fits equipment with a matching hole pattern, including the Humminbird HELIX 7 Powder-coated, marine-grade aluminum construction Supports up to 4 lbs in standard-use applications and 3 lbs in heavy-duty applications Backed by RAM Mounts' lifetime warranty Use Cases & Compatibility This ball base is designed for attaching compatible fish finders, marine electronics, and other equipment with a matching 1.5" x 3.5" four-hole pattern. Manufacturer-listed compatibility includes the Humminbird HELIX 7. The integrated 1.5" rubber ball fits a variety of RAM® C Size socket arms and mounting components, making it suitable for custom marine, vehicle, and equipment mounting configurations. Specifications Ball Size: C Size (1.5") Material: Powder-coated, marine-grade aluminum Weight Capacity: Standard Use: 4 lbs; Heavy-Duty Use: 3 lbs Pattern / Hole Spacing: Four-hole pattern measuring 1.5" x 3.5" center to center Plate Dimensions: 2" x 4" Product Weight: 0.3 lb Additional Details: Fits devices with a matching mounting pattern, including the Humminbird HELIX 7 Brand & Warranty Brand: RAM Mounts Manufacturer Part Number: RAM-202U-24 Warranty: Manufacturer's lifetime warranty Gadget Mounts is an Authorized RAM Mounts Dealer.