Aluminum magnesium alloy chest ascender provides firm grip in compact shape, widely used in rope access to keep body upright and add protection during working. Move freely and smoothly up rope and clamps to rope when pulled down with cam functioned. Easy and convenient to install rope on ascender with one-hand operation. A slot in both higher and lower end of ascender for carabiner or other gear to connect. Can be rigged as a locking pulley for light hauling.