Parasol Holder Fishing Umbrella Holder Fixing金具 Angle Adjustment Clamp Inner diameter 23mm / 26mm This is a fitting to secure a chair and parasol. I bought it for a different purpose, but it didn't fit, so I haven't used it. I purchased it for a different purpose, so I am not familiar with its original use. Please refrain from asking questions about how to use it. I have another one in stock (with the left and right specifications reversed), so if you would like it, please let me know in the comments.