Excellent abrasion resistance, with up to 10 times less wear than hardened steel | Excellent corrosion resistance | Low thermal conductivity | Very high dimensional stability | Hand-lapped measuring surfaces | Each block is identified by a serial number | Dimensional tolerances in accordance with DIN 861, ISO 3650 and BS 4311 | Thanks to a unique molecular transformation process, ceramic zircon offers a mechanical resistance that preserves its integrity in the event of an accidental drop | Available in a fine wood box or as a single piece, always accompanied by a UKAS Class C calibration certificate on 5 points