Milwaukee® Spring is designed for 49-57-0012/49-57-0013/49-57-0032/49-57-0010/49-57-0020/49-57-0025/49-57-0030 arbor assemblies for steel Hawg® bits, 49-57-0035 3/4" shank to threaded steel Hawg® cutter arbor and 3/4" shank to quick-change steel Hawg® cutter arbor.