Opened, but unused. There are 36 screws in total, 12 of each of the following three lengths. I'm selling them because I haven't used them. They are inch-standard, so they can be used on FENDER USA guitars, etc. They have a significant impact on the sound of the guitar, so I think these are reliable, quality products from a reputable manufacturer. Manufacturer: Montreux Saddle height screws inch - Set screw for string height adjustment ■ Set screws for string height adjustment ■ Inch standard ■ Stainless steel Sizes: ■ #4-40 (approx. 2.8mm) x approx. 6.35mm, set of 12 ■ #4-40 (approx. 2.8mm) x approx. 7.94mm, set of 12 ■ #4-40 (approx. 2.8mm) x approx. 9.53mm, set of 12 *Please understand that these are unused but pre-owned items. *I am also selling these elsewhere, so I will cancel the sale if they sell out.