ProMaster 5137 Pivot Arm
The ProMaster 21" Pivot Arm works like magic. Just loosen the large knob and the entire pivot arm becomes loose and adjustable. Use the spigots on each end to connect and position various accessories to your liking. Then tighten the large knob and everything becomes strongly linked together. It has a flat black finish to reduce the chance of glare sneaking into your shots.
Length: 21" / 53.3 cm
Weight: 31 1/2 oz / 893 g
1/4-20" female threaded port in aluminum spigot on one end
3/8" female threaded port in aluminum spigot on the other end