Milescraft JointMaster Self-Clamping Doweling Jig is a versatile tool designed to enhance any woodworking project, whether you are creating edges, corners, or surface joints. This adaptable jig includes three drill blocks that accommodate the most common dowel pin sizes of 1/4-inch, 5/16-inch, and 3/8-inch. Each drill block is adjustable to accept and precisely align centered dowel holes ranging from 1/2-inch to 3 inches, featuring built-in scales for accurate positioning. The JointMaster also incorporates built-in edge stops to ensure alignment every time. Its innovative self-clamping design eliminates the need for additional clamps, though the clamp body can be removed if you prefer to use other clamping solutions. Model Number: 1334