This is a rope clamp (ascender) from PETZL. It is a device used for ascending, belaying, and assisting during rescues by attaching it to a rope. It has the "PETZL" engraving on the main body and is a model compatible with rope diameters of approximately 8-11mm. Although it is an older model, it operates smoothly and is still usable. The pulley and cam parts move without issue. There are scratches and scuffs from use, so please check the photos for the condition.