The ball mount consists of a B size 1'' TPU ball connected to a 2.44" round plate. The round plate features industry-standard AMPS hole pattern and with pre-drilled holes The round plate made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, non-slip and wear-resistant The 1'' ball mount base compatible with RAM Mounts & BRCOVAN any B size 1'' ball double socket arms. Work for other devices with 1 inch swivel ball mounting pattern. Compatible with Garmin devices The AMPS hole round plate base mount with 1 inch TPU ball. Compatible with RAM Mounts B size double socket arm. The round plate made of 6061-T6 aluminum alloy material with CNC machining and iii grade hard anodized surface for durability and reliability in the most demanding environments. TPU over-molded ball head, non-slip and wear-resistant. Pack of two.