Brand Name: irwin | Material: carbon-steel | Number in Package: 1-pc. | Overall Length: 4-in. | Packaging Type: boxed | Shank Diameter: 3/8-in. | Shank Type: round-shank | Sub Brand: marples | Usage: for-wood | Drill Size: 1-1/8-in. Bores perfectly smooth, flat bottomed holes. More | 1-1/8 in. Forstner | Designed for clean holes | Teeth designed for clean holes | Cutting angles maximize speed of cut