A self-locking pulley designed for easy and secure handling. Its special shape allows one-handed operation, while the locking system enables rope insertion without detaching the device from the anchor and prevents accidental opening under load. The stainless-steel cam grips ropes from 8 to 13 mm reliably and can be easily activated or deactivated with a protected switch. Dual attachment points allow smooth carabiner rotation, and the large sheave with sealed ball bearings ensures 95 % efficiency. The robust construction features hot-forged side plates and a precision-machined aluminum sheave.