Park Tool Razor A Kick Scooter (Clear/Black) This combination chain whip and freewheel/lockring remover wrench is heat treated to prevent bending and flexing It also features hardened pins to keep the chain in place and a comfortable handle Hex opening is one-inch fits Park Tool freewheel removers Works on 10 speed rear cog systems, as well as 7, 8 and 9 cog systems