This 8 Decender helps prevent rope lock up, which is widely used in SRT in mountaineering, rappelling, adventure, training, tree climbing, caving, etc. It's also great for rigging an aerial silk or other gymnastics devices. Features: HIGH STRENGTH FORGED ALUMINUM ALLOY: Super alloy body can bear up to 7,700lbf(35kN) force with anti-burn tab for holding the device when it is hot from a long and rapid downhill descent. SURFACE ANODIZED OXIDATION: Not even a single chance for rust & corrosion during its whole life time, which certainly should be years to come under regular use. COMPATIBLE WITH ROPES FROM 8 TO 16MM: Fits perfectly with double 8.1 mm ropes up to 13 mm single lines. Weight only 4.78oz. MODERN 8 DESIGN FOR SMOOTH HANDLING: To reduce twisting of the ropes and formation of a lark's head knot. GREAT FOR ROCK CLIMBER OR SEARCH AND RESCUE PROFESSIONAL: Use Big hole to hold your main string and may use the Small hole with thin ropes if necessary, or as a belay plate. Specifications: Brand: Lixada Material: 7075 Aircraft-grade Aluminum alloy (Anodized); Hot Forged.  Color: Red / Blue / Orange / Grey / Black (Optional) Max. Breaking Strength: 35kN / 7,700lbf  Rope Capacity: 8-16mm / 1/3-3/5in Item Weight: 134g / 4.74oz Item Size: 14.6 * 7.6cm / 5.7 * 3.0in  Package Weight: 135g / 4.78oz  Package Size: 14.6 * 7.6 * 1.5cm / 5.7 * 3.0 * 0.6in Package List: 1 * 8 Descender