Check the listing for details. RAM-B-201-SU RAM Pin-Lock Double Socket Arm - B Size Mediu.... Color: Black, Condition: New. Listed at 35.94 USD. RAM Pin-Lock Double Socket Arm - B Size Mediu... RAM-B-201-SU Genuine RAM Products! The RAM-B-201-SU consists of a 1 INCHES dia. ball compatible STANDARD LENGTH double socket arm, mixed combination Pin-Lock security nut and key knob. RAM Pin-Lock security solutions are designed to withstand the harshest environments where RAM Mounts are commonly used. With an emphasis on aesthetics and function, RAM security nuts/knobs are low profile and only add a small amount of additional bulk to your system when compared to the standard knob included. At a fraction of the cost of currently available keyed locking knobs, the additional peace of mind and tamper resistance comes at a very affordable price.hardware included (1) RAM Pin-Lock Security Keyproduct dimensions Overall Length: 3.73 INCHES socket to socket length 3 INCHES ball size B Size (1 INCHES )weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lbmaterials Marine-grade aluminumpackaging type Poly BagWeight 0.3 lb hardware included (1) RAM Pin-Lock Security Key product dimensions Overall Length: 3.73 INCHES socket to socket length 3 INCHES ball size B Size (1 INCHES ) weight capacity Standard Use: 2 lbsHeavy-Duty Use: 1 lb materials Marine-grade aluminum packaging type Poly Bag Weight 0.3 lb