Superior Compatibility - The AMPS hole pattern is compatible with many devices and mounts, including fishfinders, tablet mounts and more. Easily attaches to boats, kayaks, tables, or any flat surface. Perfectly fits 1.5 inches / C size arm systems. Compatible with RAM Mounts, Arkon, iBolt and others. Designed for Demanding Environments - Constructed from powder-coated marine-grade aluminum and rigorously tested for thousands of hours in salt spray to ensure exceptional reliability and stability in harsh conditions. The 1.5" ball is made of a high-strength composite material specifically engineered to provide superior corrosion resistance, outperforming standard industrial rubber coatings. This robust design ensures long-lasting performance across marine, industrial, agricultural, and other challenging applications. Longer Service Life - The ball and round plate are High-pressure Cast in a Single Piece, rather than screwed together, for longer service life and to ensure the stability of the device. Relative to the 1.5" ball, the 1.5" ball is more reliable and stable in harsh marine environments. Round Plate with 1.5 Inches Ball, Electronic Device Mounting Base with AMPS Holes