a backsaw is any hand saw which has a stiffening rib on the edge opposite the cutting edge, enabling better control and more precise cutting than with other types of saws. backsaws are normally used in woodworking for precise work, such as cutting dovetails, mitres, or tenons in cabinetry and joinery. because of the stiffening rib, backsaws are limited in the depth to which they can cut. backsaws usually have relatively closely spaced teeth, often with little or no set.