This chest type used like a one way valve up the rope by clamping the rope then releasing and clamping again and it's easy to clip on to the rope and remove with one hand with a pull.

Feature:
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 little pulley 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.
Fits single ropes from 8mm to 13mm.

Specifications:
Material: Aluminum alloy
Color: Red / Orange (optional)
Weight: 109g / 3.8oz
Package weight: 111g / 3.9oz
Package size:9.5 * 6.5* 2cm / 3.7 * 2.6 * 0.8in

Package list:
1 * Chest Ascender