Magnetic Mounting Bracket System.  Features a machined aluminum threaded bracket with 2 large 88mm rubber coated anti-slip, anti-scratch thick rubber magnets.

Magnet Details: Diameter 88mm (2.5") X 8mm thick. 1/4"-20 male thread. 1/4"-20 female threaded holes in bracket. 

Used for mounting: Lights, Signs, Hooks, Camera & Video Equipment, etc.

Satisfaction guaranteed or your money back!