The CenterPoint Power Crank is a great way to upgrade your CenterPoint Crossbow. With up to 70% reduction in draw weight, the Power Crank fits most Mill -spec buffer tubes used on crossbows today. The ambidextrous design makes this crank easy for anyone to use. The unique mounting system allowing easy "in the field" on/off. Fits the Following CenterPoint Crossbows: Cladiator Whisper 405, Sniper Elite Whisper, Amped 415, Spectre 375, Mercenary 370, Sniper 370, Mercenary 390, Dagger 390, Heat 415.