eBay

Open from 3mm to 42mm (CAN NOT clamp on chair)
Clamp on Square shaped wood
Made of aluminum, plastic and metal
Attaches to desks, carts, benches, worktables, posts, etc.
Provides 1/4"-20 thread holes and one 3/8"-16 thread hole.

Product description

This CAMVATE UltraClamp Assembly can be install on desks, carts, benches, worktables;have 1/4"-20 & 3/8"-16 thread hole,minimum opening diameter :3mm, the maximum opening diameter: 42mm.

Net Weight: 136.8g

Package Included:

1 X Ultra C-Clamp