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I have 2mm magnets myself (I think they are N50 - it was a while since I purchased them). From my experience they are strong enough to hold a space marine arm, however if you find that the holding power isn't enough you can always use a 2nd. The larger the magnet and higher the N gauge the stronger it will hold.]]> http://www.dakkadakka.com/dakkaforum/posts/preList/751654/9852199.page http://www.dakkadakka.com/dakkaforum/posts/preList/751654/9852199.page GMT http://www.dakkadakka.com/dakkaforum/posts/preList/751654/9852349.page http://www.dakkadakka.com/dakkaforum/posts/preList/751654/9852349.page GMT