The SKF hook wrench set includes 9 keys according to DIN 1810, suitable for tightening and loosening shaft nuts of sizes 4 to 16. The hook wrenches were developed for use with SKF KM nuts as well as other KM nuts according to the standard according to DIN 981. They can also be used for N, AN, KMK, KMFE and KMT nuts, as well as for all nuts according to DIN 1804.