Socket Sizes: 17mm x 19mm, 21mm x 22mm, 3/4″ x 13/16″, 7/8″ x 15/16″. 1 21mm x 22mm Flip Socket. Socket Type：Impact Socket. 1 17mm x 19mm Flip Socket. 1 3/4″ x 13/16″ Flip Socket. 1 7/8″ x 15/16″ Flip Socket.