SmallRig HawkLock Cage for Sony A7R V A7 IV A7S III A7R IV A 1 Style:Cage To 1 3 4 in sold2024 To 1 3 4 in wipe clean after each use How to Apply Dry Erase Dots Step 1: Clean your chosen surface with a damp cloth and dry thoroughlyStep 2: Gently peel the vinyl circle off of the white backingStep 3: Hold the mat with two hands and carefully fold each side upStep 4: Place the center fold of the circle onto the table first and then slowly release each side down one timeStep 5: Smooth thoroughly as you go to avoid air bubbles Read more TEACHERS' GOOD ASSISTANTS Self Developed Patented HawkLock Quick Release Structure: One button stable self locking button and the replacement of battery