RAM Pin-Lock Security Nut for D & E Size Arms & Gimbal Brackets (RAP-S-NUT5-GU) (sku 54818)The RAP S NUT5 GU replaces the knob on 2. 25" 3. 38" diameter D E size arms and gimbal bracket. The RAP S NUT5 GU offers the ideal amount of leverage to properly tighten your mount to prevent slippage in heavy chop or in extreme vibration environments. With an emphasis on aesthetics and function, the RAP S NUT5 GU is low in profile and only adds a small amount of additional bulk to your system when compared to the standard knob included. At a fraction