The PowerDyne Skate Tool is a great addition item for all skaters that provides the three main tools used in skate maintanance in one. This tool can fit a 1/2 inch hex nut, a 9/16 inch hex nut and a 15/16 hex nut. The 1/2 inch is used on most skates to tighten the axle nuts and secure wheels. The 9/16 inch is used on some skates for tightening the kingpin nuts making it possible for skaters to choose the flexibility of their trucks. Finally the 15/16 inch one is used for tightening your standard toe stop lock nuts keeping your toe stops from free spinning during use.