Powerlock 1/2" x 3.5M/12' English & Metric Tape Measure, Cast-Metal Case Is Durable & Suitable For Heavy-Duty Use, Mylar Polyester Film Extends Life Of Entire Blade, Secure Blade Lock Won't Creep During Measurements, 16" & 19.2" Stud Center Markings Simplify Framing Jobs, Corrosion-Resistant Tru-Zero End Hook For Accurate Measurements.