SF-4 Small Black Floating Model is recommended for 5/8″ to 1-1/4″ aquarium wall thickness. this magnet is very, very strong on 5/8. The magnet set is not part of our standard line-up. It is  identical in size to our F-1,2,3 series but stronger.

Product includes: Plastic Storage Case, Spacer Block, Instructions, and an extra Acrylic Safe Pad Set (outer magnet Felt Pad and inner magnet Algae Scrub Pad).

This product is compatible with: Replacement Pad Set (A/A), Algae Cutter Bag (A), Dozer Pad (A), Scratch Removal Kit (A).

Picture is F-3 but looks the same as this SF-4 Black special model.

Always clean, inspect, and test products in an inconspicuous area of the aquarium.