All of our products are strictly produced in accordance with ISO9001 quality certification system. During production, we have a well-established inspection system to guarantee the quality for every procedure. Before delivery, we will provide a test report including drilling speed, surface and core hardness, maximum torque, and rust production for each batch of products. Meanwhile a raw material test report will also be provided from the steel factory.
Hebei Jinzuo Fasteners Co,.Ltd
Whatsapp/Skype: +86-187 2155 3005