Bacho 10-21 Bowsaw is a lightweight yet heavy-duty bowsaw for all round use. The integrated, ergonomic handle, with its built in hand guard, protects users knuckles. A unique mechanism in the handle makes blade changing and tensioning adjustments effortless. The sturdy blade fittings and high blade tension make precision cutting easier than ever before. 51 code represents DRY cutting blade. 23 code represents WET cutting blade.