With the JessEm Doweling Jig Master Kit, you can create 1/4", 3/8" and 1/2" dowel holes on the end or face of your work piece. Locations of dowels can be preset in 1/8" increments, perfect for creating multiple dowel hole configuration. Built-in alignment slot allows you to matchup dowel holes that are spaced further apart for perfect aligned dowel holes. Constructed of precision CNC machined aluminum, anodized for durability and laser engraved for fast setups. The indexing pins are made out of stainless steel. Maximum edge to center distance for dowel holes is 3-1/2". Includes: Main body and referencing angle plate, 1/4" guide mount, (7) guide bushings, drill bit with stop collar and indexing pin, 3/8" guide mount, (5) guide bushings, drill bit with stop collar and indexing pin, 1/2" guide mount, (3) guide bushings, drill bit with stop collar and indexing pin, Detailed instructions