holes in secure spaces with Milescraft StubbyBits. Bits from 1.9 '' to 2.3 '' work-clothing length. acceptable 1/4 '' hex shaft with all intelligent change and acceptable 1/4 '' and larger chucks. Each bit is precision from one piece of fast steel. This six-piece set brad-point bits for drilling wood materials with pinpoint accuracy. Includes : 3/32 '', 1/8 '', 3/16 '', 1/4 '', 5/16 '', and 3/8 '' size.