Backsaw
From DT Online
Backsaws have a stiffener along the top edge which helps to keep the blade straight and allows for closer control and fine work.
row 1, cell 1 * Tenon saw | row 1, cell 2 - the most common backsaw, typically 250mm or 300mm length with 10-14 Teeth per Inch (TPI) and used extensively for general woodworking and fine cutting of joints such as tenons. |
row 2, cell 1 * Dovetail Saw | row 2, cell 2 - similar to a Tenon Saw but shorter at 150mm to 250mm with finer teeth at 14 to 18 TPI and used for finer work such as cutting dovetail joints. |
row 2, cell 1 * Gent's Saw | row 2, cell 2 or Fancy Backsaw - typically 150mm long with very fine teeth (16 to 25 TPI) and used for very fine cutting of mouldings and inlays for example. |
row 2, cell 1 * Razor Saw | row 2, cell 2 - commonly approximately 125mm long interchangeable blades with extremely fine razor sharp teeth (i.e over 50 TPI) and used for fine work in balsa and plastics - e.g. modelling. |