Over 280 sets sold! A must have for train repair. ST-350 (Flat's) for use with the Hobby Horse Press or the original Chicago Rivet press made for Lionel and sold as the ST 350 Riveting set. I have included 4 pictures above showing the tools in different presses. Picture 1 shows the original blue ST-350 press made by Chicago Rivet for Lionel and in my personal Lionel Press made by Hobby Horse for Lionel getting a bend out of a ZW base plate in pictures 3 and 4. These flats can also be used in other presses sold on eBay that accept rivet tools. You will get 2 flat's as seen in picture 1. One for the top and bottom. I used these tools more than any of the 15 tools in the original 15 piece tool set with the possible exception of the small clincher and small rivet anvil. For a lot of repairs I use one flat at the bottom of the press with one of the original tools on top. These are made out of quality hardened tool steel. Domestic Shipping is $4.95.