PTFE coating film has excellent heat resistance and low temperature resistance. It can withstand high temperature to 300 in a short time, and generally can be used continuously between 240~260. It has remarkable thermal stability. It can work at freezing temperature without embrittlement and does not melt at high temperature. PTFE coating film has a low friction coefficient. The friction coefficient changes when the load is sliding, and the value * is between 0.05-0.15. The surface of the PTFE film does not stick to water and oil, and it is not easy to stick to the solution during production operations. PTFE is hardly corroded by , and can protect parts from being subjected to various chemical corrosion Specification: Name: PTFE Coated Screw Rod Length: 525mm/20.7 inch Screw Pitch: 2mm Screw : 8mm Color:Black Fit for CR10 Ender3 V2 3D Printer Parts Package Includes: 1x Screw with Nut Note: 1.Please allow 1~3 cm error due to manual measurement, thanks. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand, thank you