A 12" wide adjustable doweling jig kit that has 6 holes. 4 permanent 1/2", 5/8, 3/4 and 1 in holes. Plus 2 tapped holes with 2 of each size bushings: 1/4, 5/16 and 3/8. Minimum width is 1 3/4". Made from aircraft grade aluminum and steel then plated for corrosion prevention. Made in the USA.