This double 1 inch ball mount base features a 10mm mounting hole designed to attach to the motorcycle rear-view mirror or bolt head 360 rotation design: Built-in wave bead positioning design, adjust the rotation angle in sections. Make sure the mount does not turn any more after the angle adjustment is done The rear-view mirror ball mount 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 Compatible with RAM Mounts & BRCOVAN any B size 1'' ball double socket arm. Work for other devices with 1 inch swivel ball mounting pattern The aluminum alloy rear-view mirror mount base with double 1'' TPU ball and 10mm mounting hole. Compatible with RAM Mounts B size1 inch ball double socket arm. Main body made of 6061-T6 aluminum alloy for durability and reliability in the most demanding environments. CNC integral molding, solid structure. Anodized surface treatment, smooth surface, durable. TPU over-molded ball head, non-slip and wear-resistant.