Techmount 4-ROUND-B - Round Top Plate With AMP's Hole Pattern - Black MOUNT AMPS PATERN DEVICES - Great way to mount your device that has an AMPS mount style. ADAPTER CAN FIT - Many GPS, Smart Phone Cases, Satellite Radios, and Performance Gadgets that use the AMPS 32x38mm industry standard hole pattern THE TECHMOUNT SYSTEM - Each mounting system is crafted in the USA, through our patented process using high quality aircraft grade aluminum making your mounting system more lightweight, much better looking, and most importantly more durable. All accessories are interchangeable on all our mounts.