Check the listing for details. FANAUE Double Socket Arm Compatible with B Size 1" Ball Components for RAM Mount. Condition: New. Listed at 13.29 USD. The FANAUE DA-60 double socket arm is made of aluminum alloy and stainless steel, which is more durable overall.The Socket Arm can be installed with 1" ball,You can connect other devices with 1" balls through this product, and freely match them according to your needsIf you want to fix the 1 " ball of the device more tightly , you can use the Socket Arm to clamp the ball and adjust it to a suitable angle to act as a wrench , which can easily tighten the 1 " bally .The DA-60 Dual Socket Arm can be used to connect two devices with 1" ball mounts.The DA-60 Double Socket Arm has a total length of 2.3", which can be well extended and connected to your equipment. It is also suitable for the RAM mounts.FANAUE Double Socket ArmFANAUE Double Socket ArmFANAUE Double Socket ArmModelDA-60DA-90DA-150Ball Size1" Ball1" Ball1" BallMaterialAluminum AlloyAluminum AlloyAluminum AlloyArm Length60mm(2.36")90mm(3.54")150mm(5.91")