The Empire® 6 in. / 150 mm True Blue® combination square (E255IM) 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 6 in. / 150 mm 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.