[Safety Guarantee]: CE 1019 n EN 567 to ensure its safety, Rope: Suitable for single rope between 8 and 13 mm. [Light Riser]: Aluminum alloy frame is lightweight yet durable, only weighs 0.34 lbs (157.6 g), limited weight: 140 kg/308 lbs, breaking strength: 4 KN. Tension: 4KN, Length: 3.15" (8cm) Height 4.57" (11.6cm) [STRONG AND DURABLE]: Cams with solid stainless steel teeth and self-cleaning grooves maximize performance in all conditions performance (eg frozen or dirty strings), forged magnesium cams for better corrosion resistance Forged magnesium wear plates for increased durability Porous: for attaching carabiner and webbing. [Application Strategy]: Use with BASIC ascender or ASCENSION handle ascender for rope ascending pinch unlock, quick and easy operation NewDoar Chest Ascender has 2 fixing holes on the upper and lower sides of the ascender, which greatly improves the operation Climbing comfort for the user without the need to hold the rope by hand. Widely Uses: Mountaineering, rope climbing, tree climbing, rock climbing indoors and outdoors, rock climbing, outdoor bands, firemen, arborists, pulley systems, upper work, etc.