Super-Vee Tremolo Systems Mag-Lok: Anti-Deflection Device reduces string-drop during double-stop string bends. The Mag-Lok uses Rare Earth magnets to securely hold the zero-position during hard string bends yet transparently releases when using the whammy bar. It is truly the “Holy Grail” for ultimate control on all tone block style trem systems – including Floyd Rose. Installs in minutes with just a screwdriver.