S & G Tool Aid's Tire Tread Depth Gage, No. 65140, quickly measures the remaining tread on a tire, and can be used to detect unusual tire wear patterns. The sliding gage measures in inches and millimeters: three sides measure 0" to 1” in 1/32” increments, and three sides measure 0mm to 25mm in 1mm increments. The body has a plated finish and pocket clip.