1/4"drive x 1/4-9/32-5/16-11/32-3/8-7/16-1/2-9/16"
3/8"drive x 1/4-5/16-3/8-7/16-1/2-9/16-5/8-11/16-3/4-13/16-7/8"
1/2"drive x 3/8-7/16-1/2-9/16-5/8-11/16-3/4-13/16-7/8-15/16-1"
* Work well with 1/4".3/8" and 1/2" driver's socket.
* Already patented.