Wilkinson 6 Hole Tremolo. Since its introduction in 1954 this classic design is the most copied guitar vibrato bridge ever. Faithfully reproducing the size and weight of the original, this is a direct retrofit with the added benefit of a push in arm instead of the troublesome screw in type. Wilkinson also staggered the string holes in the sustain block allowing the strings to follow the natural intonation line of the bent steel saddles, keeping the strings angle of attack over the saddle intonation points more consistent and eliminating annoying string "hang up" giving unrivaled tuning stability. FREE Shipping within the 48 States of the continental USA. Buyers outside the continental USA please request a shipping quote prior to ordering.