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. Compatible with: Lethal 405 Fierce 405 BC 370 Boss 405 Burner 415 Ripper 425 Speed 425 Hero 380 Not compatible: Ripper 415 Furious 370 series Furious Pro 9.5 Swat series KI 350 KI 355 KI 360 KI 365 CHRG'D 330 Models prior to 2018