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Need some help picking out the proper sized magnets. Since from what i can see you get allot of them in most packages i am trying to find the proper size that will work both with Chaos vehicles IE landraiders and rhino/preds and if at all possible terminators ( arms) if you have a good idea on the size i would need please let me know! Cheers

Check out the ebay stores. There is usually something in the pic to give you a comparison.

While I'm not sure about Chaos, I can tell what sizes I used to magnetize my Grey Knights if that helps.

2 mm: Used to magnetize arms<->hands link and to magnetize searchlights and HK missiles on Razors/Rhinos. Tip: You don't need to drill hole through the hull of the rhino. Just make small, 0.5mm intendation on the underside of the hull and glue the magnet there.

3 mm: Used to magnetize backpack<->body and body<->arms links. Also used for some of the terminator arm<->hand links when terminator was holding something heavy, like Brotherhood banner.

4 mm: used to magnetize dreadnought arms to body.

Few notes: Use 3 mm magnets in all parts that you could consider lifting the figure from, 2mm will separate too easily in cases where it needs to hold the whole weight of the figure.
1 mm magnets are very much situational. They have very little strength, but you can use them for hatches etc (though you will need at least 2 pairs per hatch). They probably aren't strong enough to hold Predator sponsons, so I wouldn't buy them if I were you.

Also, most magnet sets sold by hobby stores are very costly compared to places that sell just magnets. Google for them or use ebay.

thanks mate gave me exactly the info i needed!