Thermaltronics M7CH176 Chisel 30deg 1.78mm (0.07") interchangeable for Metcal STTC-137 Temperature: 700 Series For Use With: TMT-9000S-1, TMT-9000S-2, MX-500, MX-5000, MX-5200 Tip Style: Chisel 30deg Tip Width: 0.07" (1.78mm) Tip Length: 0.39" (10.00mm)