then some weight must be added to the strength requirement

These high-quality ring binder mechanisms are from Germany

Meget stærk magnet - plastic med kraftig powermagnet (neodym magnet) i bunden

it's COMPLETELY off

Magnetklemme Bulldog 60 mm., Stærk magnetark-farvet then some weight must beStrong metal magnetic clip, including rubber cap. Strength (direct pull): 7 kg. Strength (vertical pull): 0. 6 kg. Width: 60 mm. Height: 58 mm. Magnetic bulldog clip with power magnet fitted on the back. Much stronger than other models with a less powerful ferrite magnet on! Magnetic clips are widely used for planning boards, whiteboards, magnetic black boards and storage shelves. Not suitable for glass boards use instead the larger Bulldog clip 75