Trolley can be hand can also drag, we usually use the trolley wheels are basically at the bottom of the box, but modern man has devised a new form of rod boxes, the boxes designed as a cylindrical shape Xinjiang precision instruments boxes, wheels outsourcing the entire outside of the box in such a roller design makes this trolley can better adapt to different terrain in Sichuan precision instruments me, such as the box can be easily pulled directly up and down stairs. General suitcase, according to the material to points Inner Mongolia precision instruments me, can be divided into soft cloth case and hard drum trolley case two (rigid and so can be divided into ABS and PC, the popularity of the material is ABS or ABS + PC as well as pure PC); constructed in accordance to points, can be divided into two suitcases vertical and horizontal rod; and by size to points, can be divided into (from small size to large size): 16 inches '18-inch', 20-inch ', 22-inch', 24-inch ', 26-inch', 28-inch ', 30-inch', 32 '' these types! Commonly used 20-inch and add trilateral 115CM (except British Virgin provision is 105CM) international standards can take on the plane and the 28-inch size and add 158CM aircraft trilateral free consignment size. Domestic aviation can check the maximum size of 32 inches. Aluminum is made of aluminum by adding some alloying elements, such as aluminum - copper alloy, aluminum - zinc - magnesium - copper based hard alloys. Aluminum is light, low cost, mechanical properties (even by force) characteristics, there is an aluminum alloy is easy to process and have a high degree of heat dissipation. Particular part of the vehicle engine is particularly suitable for an aluminum alloy material. As with most of the computer chassis is made of aluminum - copper alloy. Mainly on account of the heat. Because copper and aluminum mixed after extrusion manufactured, its thermal performance is quite good, even some high-end CPU cooling fan is the use of this material. Sichuan precision instrument boxes, precision instruments me, Shin Hae package provided by Xiongxianshenhai packaging color Limited. Xiongxianshenhai packaging color Limited (www.shenhai6688.com) (www.shenhai6688.com) strong, credible, in Baoding plastic industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Shin Hae packaging and you hand in hand into the brilliant, for a better future!