MILLER FORGE DOUBLE DUCK SNAP ON COMB 2. This electric clipper attachment is for use on the larger, professional clipper units made by Andis, Oster, Wahl, or Laube and most commonly is placed on the #10, #15,#30, or #40 clipper blades. When used on a well brushed out coat, leaves hair length up to 3/8 inches long. This is a flat bottomed comb with a front to rear, spring loaded attach action.