When boring a number of holes to the same depth, it is of considerable advantage to have some means for marking positively the extent to which the bit should penetrate the wood. The accompanying engraving illustrates a very simple attachment for this purpose. It consists of a piece of soft iron or copper wire about 8 inches long, bent double and formed with a foot at the top end. Wind the free ends tightly about the auger as shown. The gage will be adjustable. When using be careful not to bring the foot into actual contact with the edge of the hole.

Fig. 103 - Gage for augers.