Description: Solid metal construction is sturdy and durable for long time use. The positioning is more accurate than other doweling jigs, no offset or gaps are left. Adjustable doweling jig kit can be clamp on different thickness of wood boards from 10mm to 55mm. It is easy to install and convenient to use. Made of premium alloy steel material, the doweling jig is sturdy, durable, and corrosion resistant. The dowel jig holes have five sizes, 6mm(1/4), 8mm(3/8 It is suitable for drilling holes and making joints of wood boards, perfect tool for plate furniture. Item Name: Doweling Jig Material:Alloy Steel Specification: A (Imperial), B (Metric) Dowel Jig Hole: 6mm(1/4"), 8mm(3/8"), 10mm(5/16"), 11mm(7/16"), 12mm(1/2") Drill Bushing Specifications: 6mm(1/4") x 2, 8mm(3/8") x 2, 10mm(5/16") x 2 Size Details: Clamp Range: 1cm-5.5cm/0.39"-2.17" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 6 X Drill Bushings 1 X Doweling Jig