Drill bits are attached to power drills to make holes. Drill bits are made of {BLANK 1} because they’re hard and resistant to corrosion. The bodies and handles of power drills are made of {BLANK 2} because they’re good insulators.

BLANK 1
-Alloys
-Ceramics
-Composites

BLANK 2
-Alloys
-Composites
-Plastics