Feature:1. 6 Size Inner Diameters Drill Bushing: This set contains 6 size inner diameters drill bushing to meet the needs of different drill bits2. Easy Usage: The kit is equipped with a centering drill guide and a centering punch for convenient and accurate punching3. Precise Centering Drill Guide: The centering drill guide features V slot and recessed circular hole that fit flush with any board edge, flat and round side, wooden circle, etc. for best control and precise4. Sturdy and Durable: The drill bushing is made of high quality alloy steel, has high strength, with compact and portable size, which is easy to carry5. Application: This self centering dowel jig kit is used to accurately locate and drill perfectly straight holes on flat, round, edged sheetsSpecification:Item Type: Self Centering Dowel Jig KitMaterial: Alloy SteelDrill Sleeve Inner Diameter: Approx.4mm/0.16in, 5mm/0.2in, 6mm/0.24in, 8mm/0.31in, 10mm/0.4in, 12mm/0.47in.Package List:1 x Centering Drill Guide1 x Centering Punch6 x Drill BushingNote:Pay attention to safety protection when using.