Park tool cassette lockring tool fr 5cheat treated alloy tool steel one inch base fits wrench or bench vice thin wall construction allows use without removal of cones and locknuts the fr 5 has 12 splines that are approximately 23 4mm across features fits shimano sram sunrace suntour chris king and other cassette lockringsfits the sram xx1 11 speed cassettesalso fits shimano disc brake lockringsalways use a quick release skewer to hold the tool in place and snug to cogs when loose