Killer Instinct Compact DSC Crank Narrow Sled - The Dead Silent Crank is 100% silent operating with a compact body that rapidly attaches and detaches in seconds to safely and silently cock your crossbow. Narrow Sled Model Compatible with: Fatal X RIPPER 425 SPEED 425 BOSS 405 BURNER 415 RUSH 380 FURIOUS PRO 9.5 Not Compatible: Ripper 415 FURIOUS 370 SERIES LETHAL 405 FIERCE 405 BC 370 SWAT SERIES KI 350 KI 355 KI 360 KI 365 CHRG'D 330 Models Prior to 2018