Uncle Mike's Hammer Extension for Ruger Blackhawk, H and R Topper, New England Firearms Handi-Rifle This extension allows the hammer to be accessed to the side of the scope instead of underneath for more positive control of the firearm Fits Ruger BLACKHAWK, H & R topper, new England firearms hand I rifle Knurled surface to improve grip Knurled surface to improve grip For either right or left hand use Allows for easy hammer pull with low-mount scopes Allen wrench included Fits Ruger Blackhawk, H & R Topper, New England Firearms Handi Rifle