Machined steel tremolo block with silver powder coat finish Modern-style 2-1/16" string spacing Tremolo block is pre-tapped and will accept a standard 10-32 threaded tremolo arm Used on American Standard Series Strats (US) manufactured from 2008-present. Can be retrofitted to other US and Mexico series guitars using modern 2-1/16" spacing as long as the block to bridge plate mounting screws also line up properly.