K21 type to mount the "+" shaped, three-flanged, and "+" shaped impact rock blade bits and down-the hole drill bits
K30 type to mount the "-"shaped, and three-flanged blade bits for impact rock interrupted blades.
M21 type to mount the pick and the single tri-cone rotary drill bit of excavating machinery
M22 type to mount the pick of excavating machinery and cutter-loader
M23 type to mount the pick of excavating machinery