This complete set of 3 inlays, is for the front panel knobs on a Collins 75S-1. Some PTO knobs for the 75S-1 have no finger Hole. This add is for the 75S-1s that have a PTO knob WITH a finger hole.If your 75S-1 has a PTO knob with no finger hole, then please purchase the Inlay kit for the 32S-1 which has a PTO knob with no finger hole. This inlay set has a brushed aluminum finish just like the originals, and they have a plastic film on the face side which you have to remove before you instal them.It is very easy to install. You simply put a drop of contact cement in the middle of the back side of the insert and you can glue it on top of the old one, or you can remove the old scratched up insert with a pick.To remove the old one you can also drill a small hole in the middle of the old insert to remove it with a sharp tool so you do not damage the edges of the inset area.It makes such a difference to replace the scratched or dinged inlay, as they are a focal point of attention. Your Collins radio will look beautiful with a new set of inlays!