Iroda S-31 Catalyst Head and Flat bladeIroda Flat blade and catalyst combination for Iroda SP50 SP70 Wall Lenk LSP 60 and Mohawk M900 3210. The catalyst head replaces the catalyst head that comes with the Iroda and Wall Lenk Soldering Irons so that a flat or curved blade can be installed making it a furniture repair burn in knife or is a direct replacement for the catalyst head and flat blade that comes with the Mohawk burn in knife M900 3210. Flat blades and catalyst heads are also