The 45 chamfering design at the rear end threaded hole ensures smooth feeding air, smooth and smooth section of the nozzle, and highly close to the docking accessories. 303 stainless steel material, fine workmanship, high temperature resistance, ablation resistance (sturdy and durable material, stainless steel link throat specially designed for 3D printers; slow heat transfer and local cutting of stainless steel can effectively prevent heat from uploading, Avoid pre-expansion of feed and solve the problem of plug) Delivery Quantity: 5pcs, Package Contents: Only the above package contents, excluding other products. Size: 1.75mm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)