Material: High Quality 420j2 Stainless Steel, SurfaceTitanium alloy Imported Super Safe & Quick Release: very tight spring clip, never need to worry about goods falling off, a wisdom and easier way with quickdraw keychain. Super Durable and Heavy Duty: the high load-bearing of the hook stainless steel, CNC technology, high hardness, corrosion resistant, rust proof, lifetime using. Dimension: lightweight and the same as the Titanium durable, just 30 grams, each size measures about 2.30 inch (L), 1.00 inch (W). Key Ring diameter: 1.00 inch. No more burden to your daily or outdoor backpack life. -- NOTE -- the spring clip opening is only 0.5", please use more finger tip to press instead of pulp if it's narrow for your finger. And ensure the exact size of the hook too meet your demand, it might be too small as a main key hook to some users, recommend it as branch one if so. Practical gift: this is a good gift for Father's Day, graduation, bachelor party, corporate events, Christmas and other occasions and events.