This knife holder and support set is the same set found in The Knifemakers Heat Treating Kit. It contains 4 Knife Holders, and 8 Knife Holder Supports.
Knife Holder Supports - Position knife holder supports under the knife holders inside the furnace. The supports raise the knife holders so you can slide the fork under the holders.
Knife Holder - High-temperature removable pins fit into holes pressed into a ceramic base. The pins hold the foil-wrapped blades on edge so heat can circulate around each blade. (Unless you have the Gas Injection Flow Meter, you will need to wrap the blades in heat treating foil, which is not included in this kit.)