The Self Lock Speed Mark Series of tape measures is a unique line of tape measures. The 25-foot x 1-inch tape measure features a unique self locking mechanism that allows the nylon coated blade to extend smoothly as well as a push button release that insures complete control when retracting the blade. This series also provides speedmark printed fractional graduations for easy read and accurate measurements. This is the ideal measuring tool for anyone from the diyer to a professional tradesmen.