The Elkay Mfg Company Flat Washer SS .380/.400 ID x .600/.640 OD is a high-quality fastening component designed to distribute load and reduce friction. With an inner diameter of .380/.400 inches and an outer diameter of .600/.640 inches, this stainless steel washer is ideal for use in various applications, including plumbing and machinery. Its corrosion-resistant properties ensure durability and longevity, making it suitable for both indoor and outdoor use. This washer meets industry standards for quality and performance, providing reliable support in any assembly.