This is a Manfrotto 231ARM Hand-Grip Sliding Support Arm replacement, or an auxiliary Sliding Support Arm designed to fit onto the Manfrotto 231 or 231CS (old #3381) Column Stand, or any column or pipe of 1-3/8" diameter.
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Comments about Manfrotto 231ARM Hand-Grip Sliding Support Arm:
I got two extra of these when I ordered the Manfrotto column, and am very glad I did. I have a small tray on one of them and put two lights on the others. These things really grip but move very easily and smoothly.
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