(a part of) a tool used for boring or drilling holes

tiny piece

a small piece cut or broken off (from wood, stone, china, glass etc)

shard, flaw

a small, light, leaf-like piece

scale, peel

a note with half the value of a semibreve

bit

a small, thin strip (of wood); a thin piece (of something) cut off a large piece

tiny piece, usually of wood or metal

a small piece of hard material (wood, glass etc) split, torn or broken off a large piece

thin piece of solid