Carlson's ambidextrous Black Hammer Expanders for Henry .22 Rimfire Pump/Lever Rifle provide easy cocking for left or right hand shooters at all times. Installation is easy with a set screw. A knurled body allows positive non-slip cocking. They are balanced and lightweight which helps prevent uneven wear of the trigger and sear surfaces. Ambidextrous - Provides Easy Cocking for Left or Right Hand at All Times Easy Installation Balanced and Lightweight - Helps Prevent Uneven Wear of Trigger and Sear Surfaces One size Fits All T.C. Contenders and Most Exposed Hammer FirearmsSpecifications:Ambidextrous - provides easy cocking for left or right hand at all timesEasy installationBalance & Lightweight - helps prevent uneven wear of trigger and sear surfacesKnurled body - affords positive non-slip cocking.375 in diameter - 1.500 in lengthUse with or without telescopic sightsHard anodized finishWeight: Approximately .18 pounds