The Petzl Oval Screw-Lock Carabiner is an aluminum carabiner for Climbing. The screw-lock Features a visual warning in red when in the unlocked position. Make sure it's closed before you move on. Final SALE: For safety reasons, we cannot accept returns on load-bearing Climbing equipment. Sorry for being so mean. Features of the Petzl Oval Screw-Lock Carabiner Symmetrical oval shape allows optimal loading of devices with a wide cross-section, such as pulleys, rope clamps and mobile fall arresters Aluminum carabiner whose light weight reduces the weight of equipment the worker at height needs to carry May be used with a captive positioning bar to favor loading of the carabiner along the major axis, to keep it integrated with the device, and to limit the risk of it flipping Fluid interior design limits the risk of having a catch point and facilitates rotation of the carabiner Keylock system to avoid any involuntary snagging of the carabiner H cross-section ensures an optimal strength/weight ratio and protects markings from abrasion Manual screw-lock with red band provides a visual warning when the carabiner is unlocked