A 9-piece set of KM sockets with 4 internal (radial) teeth for use where the castellated lock nut (groove nut) can be accessed from the sides. KM groove nuts are often used as lock nuts on shafts or in housings to hold bearings in place. All supplied in a blow mould case for convenient storage, ideal for workshop and automotive use.Designed to work with KM locking nuts manufactured to DIN 981 standard.Sizes: 1/2"D x KM04 (I/D 34.4mm), KM05 (I/D 40.6mm), KM06 (I/D 48mm), KM07 (I/D 55mm), KM08 (I/D 61mm).Sizes: 3/4"D x KM09 (I/D 68mm), KM10 (I/D 73mm), KM11 (I/D 79mm), KM12 (I/D 84mm).Manufactured from chrome molybdenum (SCM440) with a black phosphate finish.For external KM sockets, please see Laser Part No. 8914. NOTE: Do not use with impact tools.