Product Description [Hollow Design] The retractable measure ruler adopts a hollow design that allows sand and water to pass through, making them easy to clean, just rinse it under water. You do not have to worry that water and sand will get stuck in them when you are in bad working conditions.[Double-sided Scale] The measuring tape is printed with clear and accurate scales on the double sides to meet your different measuring needs. The tape supports taking the inside or outside of the ruler hook as the reference point to ensure the accuracy of the measured data.[16FT Retractable Tape] The maximum measuring length of the retractable measure ruler is 4.9m/16ft, long enough to meet almost all measuring needs. You can pull the tape to the proper length according to your measuring project, and it is also easy to shrink back into the shell.[Waterproof & Rustproof] The retractable tape is made of premium stainless steel and ABS, strong and durable, rust and wear-resistant, waterproof and sturdy, and not easy to break and deform. The electroplated and smooth surface is exquisite and will not scratch your hands when used.[Wide Application] The retractable measuring tape is widely used for interior decoration, woodworking, agricultural or industrial application, suitable for indoor and outdoor measuring projects. The measuring tape is also a great gift for homeowners, interior designers, carpenters, metal or wood workers, architects, etc.