The RAM® Drill-Down Dashboard Mount with Backing Plate - C Size Short (RAM-101L-B-225B2U) is our go-to mount and component option for securing any holder or dock to a vehicle dashboard. This bundle includes a C size short length double socket arm with a Pin-Lock™ Security Knob, two round 2.5" diameter round bases with the universal AMPS hole pattern, and one 2.10” x 2.60” steel backing plate (hardware included). RAM®'s patented rubber ball and socket technology dampens shock and vibration and allows for near-infinite adjustment, enabling perfect viewing and operating angle of your device.