RAM MOUNTS (RAP-S-NUT5U Mixed Combination Pin-Lock Security Nut and Key Knob for 2.25"/3.38" Diameter D/E Size Arm RAM offers a diverse product line which is protected by over100 issued patentswith more than 60 patents pending RAM ball and socket mounts feature a design revolving around an elastomeric rubber ball Incorporating a non-slip feature as well as shock and vibration dampening, our often imitated but never duplicated mounting solutions are truly one of a kind and enhance every application they are used in Utilizing the finest assembly hardware, durable composites, steel, stainless steel, rubber, and aluminum, our mounting bases and complete kits are manufactured in the USA to perform above expectations and remain cost effective.