Wilkinson Contemporary 5 + 1 Stratocaster Tremolo System - Chrome. A six screw vintage style system but with the smooth fulcrum action of a two pivot set up. The unique Wilkinson 5 + 1 layout eliminates the chance of screws binding in the holes resulting in a return to original position second to none. Push in vibrato arm, stainless steel saddles and "stagger drilled" block make this an ideal upgrade for your old vintage bridge. Solid steel sustain block. Features: Smooth fulcrum action of a two pivot set up. Chrome finish. Center to center post 56mm. String span 54mm. String pitch 10.8mm. Brand new. Fresh from the factory. FREE Shipping within the 48 States of the continental USA. Sorry but no international shipping.