128-101
Fixed rod type with bases hardened, precision ground and micro-lapped. All other surfaces are satin chrome finished. The screw is also precision ground and lapped. Ratchet stop. Spanner wrench with each micrometer.Accuracy: Instrument error: 3m. Flatness of reference face (bottom face of base):1.3m for 60mm/2.5" base.2m for 100mm/4" base.
