The height of the two feet can be adjusted according to the thickness of the board, making the drilling more accurate, a powerful woodworking tool This is a set of self centering tools for holding and centering while drilling and woodworking Wide range of applications: suitable for fixing on boards of various thicknesses, two claws are convenient for quick positioning of the hole center, dust removal groove design Material: stainless steel, oxidation , high hardness, wear resistant, rust proof, durable, easy to use Parameters: sleeve: 2/3/4/5/6/8/10mm