Stanley Powerlock tape rules add convenience and usability for all kinds of measuring needs. With Stanley's unique sidelock the rule holds the exact measurement reading to prevent slippage and costly errors. All Stanley rules are designed with a convenient belt hook. It provides easy access to the tape while you are on the job. With lengths of 3 to 200 feet - Stanley offers tools to fit all your measuring needs. This Tape rule is the badge of the contractor. A few astonishing features have made this product the leader in the industry. The mylar coated blade for unsurpassed durability, blade lasts up to 10 times longer in comparative tests of abrasion resistance. There is a heat treated spring for longer useful product life. The Tru-Zero hook automatically adjusts to allow for its own thickness giving exact readings for either inside or outside measurements. The blade is two colored graphics for better readability and fewer measuring mistakes.