Feature: 1. Robust Material: Dowel jig is made of aluminum alloy material, anodized exterior and hardened steel center block structure ensure high strength. The scales are etched for accurate locating. Designed specifically for drilling and wood board joints 2. 3 in 1 Design: Equipped with 8mm, 10mm, and 12mm (5/16, 3/8, 1/2 inch) drill bits to meet your needs for different hole diameters. There is a precise scale that can be adjusted to the thickness of the board, suitable board thickness of 0-1.57in (0-40mm) 3. Easy to Operate: The self tightening clamp, easy to fix the drill guide on the wood. With this doweling jig kit, you can easily locate and drill holes, marking and aligning the jig to obtain the desired results. The pocket hole joint is suitable for leg and rail connection, and cabinet structure 4. Applicable Range: With a clamping thickness range of 0-40mm, an adjustment range of 10mm, and a drilling thickness capability of 12-40mm, this 3 in 1 doweling jig boasts a broad application scope, meeting more drilling and locating needs 5. Wide Application: This pocket hole jig is suitable for edges, T joints and L joints connection. Professional for home furniture installation, woodworking tasks, workshop, crafting projects and more application scenes Specification: Item Type: 3 in 1 Doweling Jig Material: High Carbon Steel, Aluminum Alloy Clamping Thickness: Approx. 0-40mm / 0-1.6in Adjustable Range: Approx. 10mm / 0.4in Drilling Thickness: Approx. 12-40mm / 0.5-1.6in. Package List: 1 x Hole Opener Locator 3 x Wrenches 2 x Limit Device 1 x 8mm Drill Bit 1 x 10mm Drill Bit 1 x 12mm Three Tip Bit 1 x Drill Bit Storage Box