Product Description Material High quality carbon steel. It has good handling. and high tenacity. up to a temperature of approximately 800 degrees. Anti rust Resistance to corrosion corrosion Pollution-free Quality Product Premium material High hardness Accessories M3 wrench Allen Hex-Diameter:2.0mm Length:1748mm M4 Key Hex Allen-Diameter:2.5.mm Length:1955mm M5 key; Allen Hex-Diameter:3.0mm Length:23.57mm M5 Key Hex Allen-Diameter:4.0mm Length:24*65mm T ÉNut M3 ÉTe Nuts:—-60Pieces M4 ÉTe Nuts :—-60 Pieces M5 ÉT-Nuts:—-60 Pieces Attention: The products contain small parts. ;avoid accidental swallowing. Application T-nuts suitable for 2020 series aluminum profile,widely used for building industrial aluminum frame structures, 3D printers, CNC routers, CNC laser cutters, robotics projects.