The Empire 150 mm True Blue combination square (E255M) 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 high-visibility e-Band vial allows easy level checks. The 150 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.