Home Products Heavy Portable Device FIXED SOLUTIONS different ARM List | Image 【ARM-C-090】Double Socket Arm ● Ball Size: 38.1mm 【ARM-C-145】Double Socket Arm ● Ball Size: 38.1mm 【ARM-B-150】Double Socket Arm ● Ball Size: 25.4mm 【ARM-B-080】Double Socket Arm ● Ball Size: 25.4mm 【ARM-A-S】Double Socket Arm 【ARM-A-EX】