Park tool cassette lockring tool fr 5gtthe fr 5gt is designed specifically for use when removing and installing cassette lock rings from thru axle hubs features part of a comprehensive range of freewheel removal tools the fr 5gt is designed specifically for use when removing and installing cassette lockrings on thru axle hubs utilises a 12mm guide pin to stabilise the tool in use fits 12 spline cassette lockrings from shimano sram sunrace suntour chris king and others 23 5mm diameter