Keyring dart sharpener from Shot! is a compact aluminium keyring dart sharpener with a tubular carborundum stone for maximum abrasion. Used to keep steel tip darts sharp improving entry and hold in the dartboard. Sharpen your dart point by running it along the inside of the sharpener. Keeping you darts sharp will also extend the life of your dartboard. Length - 1 1/8" Diameter - 1/2"