This is the left-hand factory standard bridge that can be used in conjunction with all BIGSBY® tailpieces. E to E String Spacing ctr to ctr of compensation: 2 3/64 in. (52mm). Post Hole Diameter: 5/32 in. (4mm). Post to post ctr to ctr spacing: 2 13/16 in. (71.5mm) Radius: 12 in. Material: Aluminum. Compensation: for wound G string 4 + 2.