After the success of the TT1634CH (same EXACT design as the TT1634C but in a softer steel) Tosa Tool continues the trend with 3 new designs, one for each of the Tormach lineup TT1100H, TT770H and TT440H. All of these plates are made with excellent higher carbon steel and all are a full .8750″ thick for extra thread and bore depth. These plates are designed for the more careful hobbyist who appreciates the savings cost. 3 times stronger than aluminum they are the best way to start with modular fixturing.