[parameters]: comes with 9 stainless steel drill bushings: 2/3/4/5/6/7/8/9/10mm, offer strong practicality and a wide range of applications. [adjustable efficient]: you can adjust the position of the two feet according to the thickness of the wood board, quickly find the center position, and achieve precise and efficient drilling.it can drill wood boards up to 45mm thick. [material]: made of aluminum alloy and stainless steel, high hardness, wear resistant, rustproof, durable, and easy to use.package includes 1 vertical self centering dowel jig and 9 drill bushings. [dowel drill bit]: this is a set of self centering drill bit tools for holding and centering while drilling and woodworking.size 7cmx5.8cm/2.76inch x 2.28inch. [wide application]: the dowel drill bit set is suitable for fixing on boards of various thicknesses, two claws are convenient for quick positioning of the hole center,, Weight: 0.6834330122 Pounds, Manufacturer: N\A