Twist-Drill.] [Illustration: Fig.127.

Twist-Bit.] [Illustration: Fig.128.German Gimlet-Bit.] [Illustration: Fig.129.

Bit-Point Drill.] [Illustration: Fig.130.

Auger-Bit.] [Illustration: Fig.131.

Plug-Cutter.] [Illustration: Fig.132.