The specially designed multi-function hook grabs on the side, top and the bottom. The 3-rivet, corrosion resistant, tru-zero hook allows accurate inside and outside measurements. The massive new bumper is designed to increase hook life. The forward blade lock design makes it easier to lock and unlock the blade. A Mylar wrapped coating extends the blade life up to 10 times longer. Huge standout of 3.35 mm for easy one person measuring Mylar coated blade is up to 10 times more resistant to abrasion than normal lacquered blades. Blade Armor coating on the first 100mm reduces the risk of breaking the tape by 95%. Wide 32mm blade makes reading the numbers easy. 3 Rivet end hook 40% stronger than a 2 rivet hook construction. Specially designed hook grabs on side, top or bottom for versatility. Cushion grip provides sturdy, slip-resistant hold. Stanley STA047443 Blue Chalk Line Level 30m 0-47-443 This chalk line has an ergonomic design, with a high impact ABS case for durability. It has an on-board hook storage, a crank which folds into case for storage and a sliding door which allows for quick and easy refill (30g. Chalk Capacity). It has a stainless steel end hook for added durability and rust prevention and can hold 30m of string.