Small Bits. Bits for boring holes less than 1/4" in diameter are of many forms, but by far the most satisfactory is the "quill" bit shown by Fig. 117. It has no delicate parts; if carefully handled it will not split the material; it enters the work rapidly, makes a round, smooth hole, and when dull can easily be sharpened by whetting or grinding. It will not, however, work with the grain. Quill bits as small as 1/16" in diameter are in common use.

Gimlet-bits are illustrated by Fig. 118, which represents one of the best forms. Most bits of this class are too weak to render the ser vice expected of them, and soon become bent or broken. They are likely to split the work and are not easily sharpened.

Fig. 116

Fig. 117

Fig. 118