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SmallRig 2058 Super Clamp with 1/4" & 3/8" Thread (2pcs Pack)
It can open Max 40mm, and minimum 15mm rods.
Comes with 1/4"-20 and 3/8"-16 thread, can be mounted virtually anywhere
Compatibility:
Accessories with diameter 15mm-40mm
Package Includes:
2x Super Clamp 735