The nozzle is M6 thread 0.4mm with insert is Hardened Steel, DLC Coatings Diamond-Like Carbon, Body is Copper Alloy Nickel Plating for J-Head heat block, Ender 3, CR10 Heat Block and most of the 3d printers using M6 tread hotend. If you are working with abrasive Carbon Fiber, Stainless Steel, wood filled or any other metal filled filaments, this will greatly improve the life of your nozzle. Kit includes: one nozzle Orifice size available: .4mm Nozzle Detail: Insert is Hardened Steel, DLC Coatings Diamond-Like Carbon, Body is Copper Alloy Nickel Plating Support 500°C High Temperature, Wear Resistant, Abrasion Resistant, Corrosion Resistant Net Weight: 2g Thread: M6 Filament size: 1.75mm Compatible with J-Head heat block, Ender 3, CR10 Heat Block and most of the 3d printers using M6 tread hotend Designed by GO-3D Print in California