Stanley 10 ft. Powerlock Pocket Tape Rule With Diameter Scale. Back of blade provides scale that measures up to 3' diameters. Corrosion-resistant Tru-zero end hook for accurate measurements. Polymer-coated blade withstands abrasion for long life. Secure blade lock won't creep during measurements. Chrome high-impact ABS case is job site tough. Slim case fits easily in pocket.