SDS-Plus Shank.
5-Piece.
Contains:
(1) 3/16″ x 4 1/2″
(1) 1/4″ x 6 1/4″
(1) 5/16″ x 6 1/4″
(1) 3/8″ x 6 1/4″
(1) 1/2″ x 6 1/4″