The EMPIRE 12in / 300mm TRUE BLUE Combination Square has precision machined working surfaces and a head with rational dimensions for a quick check of common measurements. The square has the BLADE-LOCK self-aligning draw bolt allowing quick adjustments with a secure hold. The DUAL-PITCH TRUE BLUE Vial allows easy checks for level, one and two degree slope. The 12in / 300mm etched stainless steel blade will not fade over time and has high-visibility markings. The combo square also has onboard storage for a hardened scriber.