TonePros / SM1-N Metric Locking Studs These are metric locking studs. The anchors are unused. They were used for a short period and are in beautiful condition. Please understand that this is a used item. ■ Product Description Brass, nickel-plated The SM1 is a metric locking stud & anchor set. It fits many Japanese and Asian-made tailpieces and wrap-around bridges, and by securely fixing them to the guitar, it transmits the vibration of the strings to the body, improving intonation and sustain. #LesPaul #SG #Fujigen #Tokai