Description: The combo item contains roller saddle bridge,string bridge & 4 piece screws. Excellent quality iron/zinc alloy material and testing is fine. Fully adjustable roller saddle bridge for harmonics, with smooth working rollers, complete with locking posts. Head saddle adjustment screws, and pre-notched saddles for quick installation. Equipped with large post, metric thread and pre-notched saddles. Replacement of electric guitar bridge with locking posts. Material: Zinc Alloy,Iron Color: Black Size Chart: String Spacing: Approx. 10.3mm/0.41inch Roller Saddle Bridge Size(L x W): Approx. 84.1*17mm/3.31*0.67inch String Bridge Size(L x W): Approx. 84.1*10.5mm/3.31*0.41inch Package Includes: 1 Roller Saddles Tune-O-Matic Bridge 4 Piece Screws Note: There may be 1-3 errors of manual measurement. Due to different monitor and different angle of view,the actual object may slightly diffetent from the picture.Please understand with us,thank you!