This is the base of a provision I ordered at the end of last year, and it was installed. It's the single-groove type used in 70s Fender guitars, etc. The screw holes are the same size as Fender. Since it's KTS, screws were not originally included. Currently, KTS is not producing plates, and the bridge set is not available new. It was installed for about two months, so there isn't much sign of use. It has been stored in a smoke-free, pet-free room. Thank you.