This set of (2) Aluminum Tapered Risers and 18-8 Stainless Steel Hardware, is required for each radio or accessory in your station, and will tilt your gear back, making them easy to see and operate! They will fit all of the Collins S-line gear as well as the KWM-2 and KWM-2A Transceivers. This set of (2) very hard to find Aluminum Tapered Risers, are Milled to Original factory specifications, and have the original satin black finish. They are tapered top to bottom and front to back so your radio will sit flush and flat on the front feet. They are not cheap foreign made plastic imitations. The (2) long screws included with this set, are 18-8 stainless steel and not cheaper zinc plated steel. Stainless hardware was originally supplied with Collins Radios because regular steel hardware will strip easy and will rust.To install these extenders you simply remove the two front feet on your radio and use the supplies screws to go through the existing rubber feet and extenders.I have a limited supply of these sets of feet so please do not hesitate to purchase them for your Collins Station.They come with a full money back satisfaction guarantee!I also have a full set of feet and risers with all the hardware in another listing if you need to replace worn or cracked rubber feet.