This new model is an Adaptation of our model DI 2000 except that all four holes are tapped to take replaceable drill bushings. Now you can drill a multiple combination of holes using various hole sizes. The jig does not have to be moved and is therefore more accurate. Drill hole sizes are -1/4", 5/16" & 3/8". Six drill bushings are supplied, two of each size. The bushings and centers are precision hardened drilled steel and plated for rust protection.