Allen Hardrock Ar500 3/8in Gong Target 8in Safe at 200-yards, targets can be used with centerfire handgun and firearm cal. up to .300 Winchester Magnum (.300WM, .300 WinMag) Provides the greatest durability and longevity, lasting thousands of rounds Durable AR500 steel provides audible and visual feedback during target practice—white powder coating helps you spot hits Square holes on the top of the target are for carriage bolts