Genuine Milwaukee accessories. Steel blade design with nylon clad (extra thick nylon coating) for increased durability. Best in class stretch performance : 50% less stretch. Ultra durable design : reinforced metal handle and drop durability. 3:1 clutched planetary gearing for 10x longer gear durability and smooth rewind. GRIME GUARD : debris wiper keeps blade clean and clear of abrasive material. Class II accuracy. 2 sided scale printing. Metric measurements shown on the top side and imperial (inches and feet) on the underside of the blade.