Adjustable, No friction, heavy-duty revolving metal depth stopper produces a clean surface and provides simple, adjustable depth-stop developed for Quick and easy adjustment of the countersink and drill depth. The user friendly design enables control of both without the need to disassemble the depth-stop. The minimum length with Countersink in the adapter will be 1/16" And the maximum will be 3/8". It will fit the following Amana Tool carbide Tipped countersinks with 5/16” shank: 55200, 55201, 55202, 55203, 55204, 55205, 55206, 55208, 55600, 55602, 55604, & 55608. Hex key - included. Countersink not included, #55246, (D) diameter 1-1/4, (D) shank 3/8, overall length (L) 2-1/2 - 2-25/32, 55246 adjustable depth stop and no-thrust ball bearing adapter 1-1/4 dia x 3/8 inch Shank