This snap clasp is made of TC4 titanium, tough & light weight. The spring gate is made of stainless steel, durable & reliable. SPECIFICATION: style A: length: 30mm, width: 16mm, thinkness: 4mm, hole size: 7mm4mm, weight: 3.1g style B: length: 35mm, width: 16mm, thinkness: 4mm, hole size: 5mm, weight: 3.8g style C: length: 53mm, width: 24mm, thinkness: 4mm, hole size: 12mm7mm, weight: 8.5g Solid Titanium Snap Clasp, Carabiner, Keychain Hook, Quick Release Clasp