Attributes . Push-Release Self-Locking Mechanism Controls Blade Retraction, Stands Abrasion, Holds Securely to Metal Surfaces (On Specified Models), 16 in and 19.2 in Stud Center Markings Simplify Framing Jobs, Corrosion-Resistant Tru-Zero End Hook for Accurate Measurements, Fractional Read Blade Graphics for Quick and Easy Measurements (On Specified Models) . Names