Wolf Tooth internal safety lock for Center Lock disc brake rotors, compatible with 12mm and QR thru-axle hubs.The slim design of this security lock with its internal knurling allows it to fit on frames/forks that do not have room for the external security lock Wolf Tooth CENTER LOCK EXTERNAL CNC LOCK ( Sold separately ).CompatibilityCompatible with 12mm and QR thru axlesTorque to 40 NmInstalled using Wolf Tooth Pack spanner and cassette lockring insert.Technical characteristics.Weight:10,5 gMaterial:Aluminium 7075-T6 with stainless steel wedge washerColour:BlackMade in USA.