The allowable deviation of the surface quality and geometry of the channel is specified in the standard. Generally, there must be no harmful defects on the surface, and there must be no significant torsion. The permissible values ​​of the channel wave bend (cutter bend) and the relevant parameters of the groove shape of each specification (h, b, d, t, etc.) are specified. Value, tolerance value. The main manifestations of the incorrect geometry of the channel are: angles, legs and legs. Solar Street Light,Led Street Light,Led Street Garden Lamp,High Power Led Street Light JIANGMEN MOSCOT OPTOELECTRONIC TECHNOLOGY CO.,LTD. , https://www.sensorsled.com