The RAM Hi-Torq&trade  Wrench is designed to be used with the knob found on "D" size ball arms and mounts. The wrench matches the shape of the knob found on the side of "D" arms, and lets you give the arm an extra tight grip. This wrench was originally made for the military when using the RAM mounts in cold weather, and the knob could not be tightened by hand.

Material: 
Powder Coated Marine Grade Aluminum 

Ball Size: 
2.25" Rubber "D" Ball Size 

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