This is a Floyd rose type locking nut. it came off the neck of an 80's Kramer. I believe it is an R2. it is a 43mm or 1.700 nut width. other dimensions. .605 over all nut hight at highest point .370". screw spacing is about .570". screw location distance from fretboard .250" or 1/4". has an H and L on the bottom side. shows some signs of wear on back sides of string locks. I'm sure it will definitely lock the strings from moving.