Specification: Thread Size: M6 x 1mm ;Thread Type: UNC ; Width: 10mm/0.39"; Height: 6mm/0.23";Material: Carbon steel;Grade: 4.8. Application: Used for pipe furniture, tables and chairs, shelves, vehicles, trolley casters and other threaded connection. Steps: First clean the welding surface, using sandpaper or steel brush to remove the joint oxide.Second welding a little bit and adjust the verticality of the thread .Finally solder all the solder joints. Package Content: 100 Pcs (+/- 2%) x Square Weld Nut Advantages: Flat solder joints, high-quality steel ,good weldability, thread size accuracy. Quantity: 100 PCS Note: It does not include other things, the color is based on the first picture, and the other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thanks!