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"For: Gas Powered Framing Nailers / PT Series Ring Shank Clipped Head 33 degrees - Nails & Fuel Ring shank nails have a series of rings punched into the surface of the shank. A difference in the diameter of the shank is produced making it even more difficult to withdraw the nail. Ring shank nails have to be produced at lower speeds and their cost is generally higher than for a smooth shank nail. The air consumption per nail is also higher, and the energy required to drive these nails into hard wood is very much greater."