Hammerhead magnets..

[Riotfishdude]

Hi guys,never sold these magnets but have read that they can scrap coraline off glass,find that hard to believe but many have said so...

I have used good ol cheapo Hagen magnets without probs,other then they sink when unattached,i have ordered one of these Hammerhead's out of curiosity,anyone using these in here?.....worth the $?....am curious to others experiances....Thanks......Riot....