This is a series of steel measuring tapes made by our CROWNMAN brand: Industrial Grade, Economy Grade, Mini Grade. Industrial Grade: These two types of 2-level accuracy are suitable for accurate measurement by professional workers. The first steel tape measure is ABS&TPR case, the tape is 0.11mm in thickness and the nylon coating surface is more wear-resistant. The mold structure is more suitable and the ruler belt is pulled smoothly without any noise. The heat treatment of the spring is stable so that the ruler belt retracts evenly without any hitting. This steel tape measure is ABS shell, which is a very small style and much smaller than ordinary models. The thickness of this tape is 0.12mm, and the overall mold is more compact. It is smoother, more resistant to falling, more durable, and has a longer life. These three economical types are used for daily use, building construction, and comprehensive surveying. They are 0.11mm thickness tape and 65M heat-treated springs. This is a single brake PC transparent type, which can allow you to clearly see the internal structure. This ABS and rubber-coated, with three brake buttons, and a comfortable grip. This mini type is an ABS and TPR shell. It is 3 meters and 0.105mm in thickness and the width size is 12.5MM. It is light and compact and easy to carry, which is mainly for DIY, home use, and also used as gifts.