The RAM-B-316-1-202 base consists of a 2.5" diameter round plate with universal AMPS hole pattern end making it suitable for use with smaller Netbooks, iPads and the like but is not suitable for use with larger laptops. We suggest the use of theÂ RAM-316-1 for items weighing up to 2kgs and the RAM-316-3 for Laptops with 15" (or larger) screen sizes. Installation Instructions: At right angles to the base of the flexible 18" long leg is a foot with a mounting hole. Simply place the passenger seat mounting bolt into the holeÂ and adjust the mount to the required height with the flexible leg. The rigid flexible arm will hold everything you need safely and securely. Components: RAM-316-1A, RAM-B-202 and RAP-B-200-1.