The RAM-B-166-UN4U consists of a 3.3" diameter suction cup twist lock base, double socket arm and universal Finger Grip&trade   cradle. The suction cup, twist lock base is designed to have a strong hold on glass and non-porous plastic surfaces, including RAM adhesive disks. 

The universal Finger Grip&trade  cradle is designed to hold a large amount of cell phones and electronic devices. The cradle comes with (3 sets) of four flexible rubber coated fingers placed along sides to grip your device. The fingers open by squeezing the ends to open the small finger arms. The bottom of the cradle includes a back plate that adds support to the device being held by the mount.

Height Dimensions:
Minimum with Top and Bottom Plates: 5.25"
Maximum with Top and Bottom Plates: 6.0"
The top and bottom plates can be removed for larger devices.

Spine Plate Dimensions: 
2.5W x 5.0H"

Using Short Arm Side Clamps:
Maximum Depth: 0.75"
Minimum Width: 1.25"
Maximum Width: 3.0"

Using Medium Arm Side Clamps:
Maximum Depth: 1.25"
Minimum Width: 1.5"
Maximum Width: 3.5"

Using Long Arm Side Clamps:
Maximum Depth: 1.6"
Minimum Width: 2.25"
Maximum Width: 3.5" 

Material: 
High Strength Composite and Powder Coated Marine Grade Aluminum 

Ball Size: 
1" Rubber Ball "B" Size 

Note: 
The "U" in the part number reflects product packaged in poly bag.