Square Drive Adaptors are used as a converter to permit use of sockets with impact wrench of different drive sizes i.e. higher or lower. These are available in 14", 38", 12", 34", 1", 1 12" and 2 12" square drives of adjacent reducing increasing combinations of male and female drives. These are of two designs : Square Drive Adaptor with, cross holes for conventional impact wrench. Square Drive Adaptor with groove for locking ring and pin for impact wrenches with cross hole in male square drive.