Dowels are available in Birch, Oak or Walnut. To be used with Millar standard stepped drill bits. The innovative stepped and ribbed form of these dowels (or maybe they should be called wooden nails) keeps the glue where you want it, in the joint, without the problem of compression experienced in ordinary dowel joints. The ribs grip the sides of the stepped pockets as they swell with the glue to lock them in place. Tap the dowel in to the hole until fully seated. Trim off and sand level - Miller dowels are self capping - so job done!