Type 1:
Slim Probe 1, foot DIA. 8 mm for hard to reach areas or irregular shapes.
Type 2:
Chisel shaped (angled foot) for hard to reach or narrow areas.
Type 3:
Slim Probe 2, DIA. 5.0 mm. A thinner foot for reaching hard to get places or irregular shapes.
Custom designed durometers conform to the Hildebrand Company standard.