The Komelon 12 ft. Self Lock Speed Mark tape measure features a unique self locking mechanism that allows the blade to extend smoothly as well as a push button release that insures complete control when retracting the blade. This tape measure also provides printed fractional graduations for easy read and accurate measurements. This is the ideal measuring tool for anyone from the diy'er to a professional tradesmen. This tape measure also has a nylon coated blade for maximum durability.