1. A bit for enlarging the upper part of a hole
   - counterbore, countersink

Derived forms: countersink bits

Type of: bit

• pinnace
• pinnacle
• pinnate
• pinnate leaf
• pinnate-leafed
• pinnate-leaved
• pinnated
• pinnately
• pinnatifid
• pinnatiped
• pinnatisect
• pinner
• pinning
• pinniped
• pinniped mammal
• Pinnipedia
• Pinnotheres
• Pinnotheres ostreum
• Pinnotheridae
• pinnule
• pinny
• pinochle
• pinocle
• pinocytosis
• pinole