The Empire 400 mm True Blue combination square (E280M) 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 drawbolt allowing quick adjustments with a secure hold. The DUAL-PITCH True Blue vial allows for easy check for level, one-, and two-degree slope. The 400 mm etched stainless steel blade will Nt fade over time and has high-visibility markings. The Combo square also has Onboard storage for a hardened scriber.