Can be used in horizontal or vertical positions. Complete with a 3-Jaw chuck, 6 masking plates, & 8" faceplate. Designed for milling, drilling, jig boring, and many other shop applications. Hardened and ground 24 Position index plate (15° increments). 360° satin chrome graduated ring with a 5-minute adjustable vernier plate ensures accurate readings. Fast and simple indexing of 2, 3, 4, 6, 8, 12, and 24 divisions. Also capable of "indirect indexing" using the worm drive mechanism. Chuck thru Hole Diameter: 1-23/32".