RAM-B-138-UN4 – RAM® Finger-Grip™ Universal Mount with Drill-Down Base
The RAM-B-138-UN4 pairs the RAM® Finger-Grip™ universal cradle with a 63.5mm (2.5") round drill-down base and a medium B-size double socket arm. The base bolts down to any flat surface using its AMPS hole pattern, giving you a permanent, vibration-dampening mount for a phone, GPS, or handheld radio.
Key Features
Spring-loaded, rubber-coated Finger-Grip™ fingers grip your device from both sides; squeeze the ends to open
Includes 3 sets of 4 fingers (small, medium, large) plus optional top and bottom supports
63.5mm (2.5") round drill-down base with AMPS hole patterns for a solid, permanent fix
Medium B-size double socket arm with ball-and-socket adjustment at both ends
Powder-coated marine-grade aluminium, stainless steel, and high-strength composite; backed by RAM Mounts' lifetime warranty
What's Included
RAM-HOL-UN4U Finger-Grip™ universal cradle
RAM-B-202U 63.5mm round drill-down base with 1" ball
RAM-B-201U double socket arm
RAM-B-238U 62 x 33mm diamond base with 1" ball
Dimensions & Specifications
Round base diameter: 63.5mm (2.5")
4-hole AMPS pattern: 1.181" x 1.496" (30mm x 38mm)
3-hole AMPS pattern (120-degree): 1.812" (46.0mm)
Arm overall length: 94mm (3.69")
Arm socket-to-socket: 76mm (3")
Ball size: 1" rubber ball (B series)
Weight: 476g (1.05 lbs)
Materials: powder-coated marine-grade aluminium, stainless steel, and high-strength composite
Compatible Devices
The Finger-Grip™ cradle fits 120+ GPS units, handheld radios, and phones across 11 brands. For the full compatible-device list and complete cradle dimensions, see our RAM-HOL-UN4U cradle listing. Always measure your device with any case fitted before ordering.
