Contains - Vertical drilling jig 150 mm length 1 x 6+8+10 mm nut 1 x self-centering drill bit φ6 mm+8 mm+10 mm 10x short thin dowels + 10 short dowels + 10 long dowels 3x stop rings 1x Allen key Red 2 IN 1 - Combined drilling and center marking, without the need for manual measuring and marking. Used with a self-centering drill bit, each vertical drilling ensures the accuracy of the hole position. Universal - By adjusting the position of the jig's feet, it adapts to different thicknesses of boards, providing great flexibility. Equipped with drilling bushings of different sizes, it meets the drilling needs of different diameters. Durable - Compact and easy to store. Made of aluminum alloy with an oxidized finish, it offers high hardness, wear resistance and rust resistance. The chip evacuation groove is smooth and jam-free. Versatile - For fast and accurate dowel joints, ideal for drilling into the sides of boards, making furniture, making joinery joints and DIY wood