RAM® X-Grip® Phone Mount with RAM® Track Ball™ Base (RAP-HOL-UN7B-354-TRA1U) Type_RAM B Size 5" diameter round base that

5" diameter round base that contains the universal AMPs hole pattern

Ball Size: RAM Snap-Link (3/4")

The RAM-HOL-UN8B expands and contracts for perfect fit of most 7" tablets

see RAM-GDS-DOCK-ZE21PDU

RAM® X-Grip® Phone Mount with RAM® Track Ball™ Base (RAP-HOL-UN7B-354-TRA1U) Type_RAM B Size 5" diameter round base thatThe RAP HOL UN7B 354 TRA1 consists of a Track Ball base, composite double socket arm and universal spring loaded X Grip cradle for cell phones. This design features a 1" diameter rubber ball and socket system with adjustment points at both ends of the socket arm. The spring loaded X Grip cradle expands and contracts, allowing for a seamless fit with your phone. The kit is the perfect complement to the modern and sleek interiors of today's vehicles,