Driver Tools Basic Set “Custom-made” Driver Tools Now you can have the proper-size driver for nearly any auto-motive seal, bearing, or bushing installation job. These sets include discs and handles, spacers and drivers.. Discs range from 1/2 to 4-1/2 in diameter, in 1/16 increments. No. 27794 – Basic set. Includes two handle sizes and 41 discs, ranging from 1/2 to 3 diameter along with plastic storage box and insert. 27794 No -