Thank you for viewing my listing from among many products. This is a ligature for a GF-MAXIMA metal tenor saxophone. It can be used with either the top-screw or the reverse-screw method. Although I haven't used it much, I used it with Otto Link and Gotts metal mouthpieces. However, it is adjustable, so it seems to fit a wide range of metal mouthpieces. The set contents are as shown in the photos, but according to the instructions, there is only one screwdriver missing. However, I think a regular small flathead precision screwdriver will work fine. Please refer to the profile section before purchasing. Thank you very much.