Light alloy chest ascender with stainless steel cam insures a high resistance to wear and tear. Very simple and quick manipulation. The lower hole keeps the device parallel to the harness thus brings efficiency of every movement. Ideal for climbing, caving and rescue. 4152111 Rope Diameter 5/16" - 1/2" | 8 mm - 13 mm Weight 0.36 lbs | 165 g Standards EN567,EN12841/B