Product Description As a sophisticated steel pipe producer in China, we often conduct the second testing in advance. Before production, choosing and checking the suitable raw material is fundamental to the overall construction project. In terms of checking, do you know the testing aspects it contained? At first, we may check the surface of our products to avoid obvious scratching or rusting. It is well known to us that steel pipe surfaces should be evenly without grease or oil. Smooth surface is benefit to make a tight-fitting components. Secondly, gauging thickness is also involved in the testing process. Thickness must be precise in order to accord with the requirement of you. Besides, zinc layer is also very important for customers. Last but not the least, we can have third party checked our steel pipes according to the request of customers. Product Feature With skillful production experience and continuous innovation in the processing technology, our products have better quality assurance. For instance, our pre galvanized pipe looks much brighter, much smoother, and much flatter, conducive to the late processing treatment of pipes, such as painting, electrostatic spraying and etc, so as to ensure the better adhesion performance and nearly perfect surface effect of finished pipes. In addition, we are able to offer various customized pipes as per your personal requirements so as to maximize the effectiveness of the actual application in real life. Product Specification/Models product range: 12.7*12.7-400*600,WT:0.5mm-16mm Application you may encounter this kind of situation that you are in question about product quality before placing a large order. We , of course, can understand the way you are anxious about. In order to wipe off your doubts before concluding an order between us, we can send you a sample freely in advance lest the final products make you disappointed. We can ensure the sample is in accordance with the primary product including the thickness of zinc layer, pipe thickness, as well as other details about steel pipes. Briefly speaking, you can put assurance on our samples. There will be no accidental matters about product quality. Other Information Contact us: [email protected] Tel/Whatsapp: +8613388081802 Payment T/T L/C