All of our products have a "3**0degree stardard"(1)The angle between top bar and low bar is *0 degree (2)The angle at each corner is *0 degree (3)The angle inside each corner is *0 degree 2.The top wire.It's nearly perfect straight after welding.For a ***0mm product,The STRAIGHT tolerance is 3.The welding point Our welding point is very neat and clean.It needs a very high welding skill to make this happen.We do training for each workers hand by hand to ensure the quality