Dowel centers allow you to precisely transfer the location of one set of dowel holes to the corresponding holes in the other half of a doweled joint. Just drill one set of holes, slip in the dowel centers and press the joint together. The pins on the dowel centers will precisely mark the hole locations on the other member. Available in four different sizes (each includes eight transfer pins of whichever size you choose) : 1/4"", 5/16"", 3/8"" and 1/2"".
I'm surprised of colors Dowel Centers-Individual Sizes. Looks much better than on images!