1、Use marine grade 304 stainless steel, with good strength and rust resistance, you can use round rings with confidence 2、After high‑precision polishing, the round rings has a glossy appearance, you don't have to worry about scratching your hands 3、Stainless steel O-rings, with exquisite workmanship and welded closed design, is a multi-functional tool that can be used for many purposes 4、Durable and corrosion resistant, the round rings are very suitable as a component of luggage, saddle, hammock yoga rings 5、Has good practicability and is very suitable for sailing, diving and harsh outdoor conditions 5 x Round Rings Welded Item Type: Round Rings WeldedProduct Material: Stainless SteelProduct Size:Diameter S (mm) / Center Distance H (mm)Approx. 3 x 15mm / 0.1 x 0.6inApprox. 3 x 20mm / 0.1 x 0.8inApprox. 3 x 25mm / 0.1 x 1.0inProducts Used In: Navigation, Diving, Boats and Outdoor Applications Under Harsh Conditions, Fitness Rings, Yoga Rings, Dog Rings, Luggage Accessories, Etc.