Wilkinson 5+1 Hole Steel Block Tremolo The Wilkinson WV6 series provides the unsurpassed "tone transfer" of a six screw pivot system with the smooth fulcrum action of a two pivot set up. With the unique 5+1 pattern one hole is used to locate the vibrato laterally while the five remaining elongated slots eliminate the chance of screws binding in the holes. The result is a tremolo that returns to the original position like no other. Solid steel sustain block [SKU:WV6SBCR] Center to center post= 56mm String span= 54mm String pitch= 10.8mm