Question: what are hair trimmer sizes?
Answer: Number 1 – one-eighth of an inch., Number 2 – one-quarter of an inch., Number 3 – three-eighths of an inch., Number 4 – one-half of an inch., Number 5 – five-eighths of an inch., Number 6 – three-quarters of an inch., Number 7 – seven-eighths of an inch., Number 8 – one inch.