The Nite Ize SlideLock Carabiner has a slide-to-lock feature that securely locks the gate with a simple push and slide movement, and unlocks when you want it to just as easily. The rectangular stainless steel body is low profile, and slim; it feeds more easily through smaller openings and rests flat in pockets. Size 4 would be perfect for attaching to a belt loop or backpack to carry slightly larger items like bottles. Size 4 Durable Stainless Steel Locking Utility Carabiner Secure stainless steel wire gate with a slide-to-lock feature Also available in Stainless Steel Dimensions: 2.0" x 3.1" x 0.1" | 52.0mm x 78.5mm x 3.0mm Weight: 1.1oz | 31.00g Weight Rating: 75lb | 34kg WARNING: Not for use where disengagement could result in bodily injury or property damage. Not for climbing.