Laser Protective Lens Seals(21x15x2.7),Laser Seal Ring for SUP Handheld Welding SUP20S/T SUP21S/T SUP23S/T,Fiber Laser Head Protective Lens 18x2 Laser Seal Ring (21x15x2.7)

["【Stainless Steel Spring】The spring of this laser protective lens seals is made of stainless steel material with high strength, high hardness and high elasticity.","【High-quality PTFE Material】This laser protective lens seals is made of high-quality PTFE + Stainless Steel material, durable and wear-resistant, good toughness, long service life.","【Good sealing performance】The surface of this laser protective lens seals for laser cutting head is smooth, low friction, good sealing performance, providing you with a good user experience."]