hex shank drill - top and side view
General Purpose Hex Shank Drills are designed for use in cordless screwdrivers and drills. For general purpose drilling. Hex shank has a recessed snap-in ring to lock drills into drill chuck.
Hex Shank Drill - General Purpose page 29
Hex Shank Drill - Heavy Duty page 29

Hex Shank Drill Sets page 29
DS-QHSD-10 1/16 to 5/32 by 64ths 1/4" Hex Shank Drills - 118 degree point
DS-QHSDH-10 3/16 to 1/4 by 32nds 1/4" Hex Shank Drills - Split Point