Features: Made of aluminum and hard steel drill bushing, durable and accurate to use. Centerlines ensure accurate alignment when drilling into various surfaces.By holding the drill guide body, easy to get vertical hole drilled without any deviation. The hole jig is a great tool set for both furniture factory and woodworking enthusiasts. Can drill in the round pieces, corner and etc. With comprehensive parts list, the Woodworking Doweling Hole Jig is the perfect addition to your toolkit, streamlining the process of doweling for projects of all sizes. Specifications: Component:Aluminum Color:Redness/Blue Size:Approx.9x7cm/3.54x2.76inch Package Includes: 1 Set Woodworking Doweling Hole Jig note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.