• Heavy Duty Split Ring: High quality type 316 stainless steel. Corrosion-resistant, great for use in marine environments.
• Glossy and Shiny: Silver color, general and simple, can match with items of various colors
• 6 sizes are available. Round 20mm - Outer Diameter: 20mm, inner diameter: 16.4mm. Thickness: 2.4mm. Weight: ~1.4 g/piece. Round 25mm - Outer Diameter: 25mm, inner diameter: ~21mm. Thickness: ~2.8mm. Weight: ~2.2 g/piece. Round 30mm - Outer Diameter: 30mm, inner diameter: ~24.7mm. Thickness: ~3.3mm. Weight: ~4.1 g/piece. Flat 30mm - Outer Diameter: 30mm, inner diameter: ~25mm. Thickness: ~2.75mm. Weight: ~4.1 g/piece. Flat 25mm/20.5mm - Outer Diameter: 25mm, inner diameter: ~20.5mm. Thickness: ~2.4mm. Weight: ~2.8g/piece. Flat 25mm/21mm - Outer Diameter: 25mm, inner diameter: ~21mm. Thickness: ~2.2mm. Weight: ~2.2 g/piece. 
• Replace worn key ring keys links connectors.
• Suitable for organizing your house keys, office key, car key, motorcycle key, boat key, scuba diving, hanging cards, dog/pet leash, jewelry making, arts & crafts projects, etc.

Type 316 stainless steel contains 2-3% molybdenum which increases corrosion resistance, improves resistance to pitting in chloride ion solutions and increases strength at high temperatures.
Type 316 grade stainless steel is particularly effective in acidic environments. It is effective in protecting against corrosion caused by sulfuric, hydrochloric, acetic, formic, and tartaric acids, as well as acid sulfates and alkaline chlorides.
Great for use in marine environments.
6 sizes are available: 
(1)Round 20mm - Outer Diameter: 20mm, inner diameter: 16.4mm. Thickness: 2.4mm. Weight: ~1.4 g/piece.

(2)Round 25mm - Outer Diameter: 25mm, inner diameter: 21mm. Thickness: 2.8mm. Weight: ~2.2 g/piece.

(3)Round 30mm - Outer Diameter: 30mm, inner diameter: 24.7mm. Thickness: 3.3mm. Weight: ~4.1 g/piece.

(4)Flat 30mm - Outer Diameter: 30mm, inner diameter: 25mm. Thickness: 2.75mm. Weight: ~4.1 g/piece.

(5)Flat 25mm/20.5mm - Outer Diameter: 25mm, inner diameter: 20.5mm. Thickness: 2.4mm. Weight: ~2.8g/piece.

(6)Flat 25mm/21mm - Outer Diameter: 25mm, inner diameter: 21mm. Thickness: 2.2mm. Weight: ~2.2 g/piece.

A perfect solution for attaching gears onto your BCD.