RAM 4"Clamp Base with D Size Ball (RAM-D-247U-4) Type_RAM B Size The swing arm connects with

The swing arm connects with a bolt and knob system

The RAM-B-132RU consists of a zinc-coated u-bolt base

Tough-Tray™ Dimensions: Tray Depth: 10

No-Drill™ mounting base offers lowest profile in the industry

The GoPro®/Action Camera adapter attaches directly to the under-side of the camera

RAM 4"Clamp Base with D Size Ball (RAM-D-247U-4) Type_RAM B Size The swing arm connects withThe RAM D 247U 4 consists of a 4" clamp base with 2. 25" ball. Specs & Features Material: Powder Coated Marine Grade Aluminum Ball Size: 2. 25" Rubber Ball "D" Size Weight: 1. 44 lbs. Note: The "U" in the part number reflects product packaged in poly bag.