for end-to-end, edge-to-edge and edge-to-end doweling Unique revolving turret design is extremely accurate and simple to use Accepts 6 sizes of twist bits: 3/16", 1/4", 5/16", 3/8", 7/16" and 1/2" Professional kit includes the following accessories: 3 brad point drill bits: 1/4", 5/16" and 3/8"; 30 dowel pins: 10 of each 1/4", 5/16" and 3/8"; 3 drill stops: 1/4", 5/16" and 3/8"; 6 dowel centers: 2 of each 1/4", 5/16" and 3/8"; 1 hex wrench and craft glue Guide bars are graduated for fast positioning of hole center for use on boards up to 4" thickness Rust resistant plated turret and parts