High quality w/ metal material and plastic top. A standard chrome tremolo arm screw fit with a 6MM thread Please check your guitar ( use an M6 bolt) this will fit an M6 thread Chrome plated, includes three plastic end cap Fits a lot but not all tremolo bridges The shaft is 6mm diameter and is threaded to be screwed into a tremolo bridge. The thread is M6. Please note that not all tremolos have the same shaft thread, although this one 6MM appears to be the most common.