Thermaltronics M7MF375 Micro Fine 0.25mm (0.01") interchangeable for Metcal STTC-190 Temperature: 700 Series For Use With: TMT-9000S-1, TMT-9000S-2, MX-500, MX-5000, MX-5200 Tip Style: Micro Fine Tip Width: 0.01" (0.25mm) Tip Length: 0.53" (13.40mm)