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We have found that for larger backsaws and our hardware store saw a 3-square machinists file produces the best result. 3-square files have the smallest arrises, and being second cut, cut finer and better on thin plate saws. The narrow arrises mean deeper gullets and faster sawing.
You should always fit a file to a handle for proper use; saw files have different tangs than regular files and therefore do not correspond with the usual handle size recommendations. Nearly all of our saw files use a #3 Skroo-zon handle, the 7″ slim uses a #4 (see below for the link). The Needle File Handle does not match a Skroo-zon handle but rather a plastic handle made by Corradi called “Handle for Needle Files and Other Small Shafted Items” linked below.
See our Specs tab for sizing info and TPI recommendations.
Made in Italy.
| File Size | Length mm | Cross Section mm |
|---|---|---|
| 4" | 100 | 6.0 |
| 4 1/2" | 115 | 6.0 |
| 5" | 125 | 7.0 |
| 6" | 150 | 8.5 |
| 7" | 175 | 10.0 |
| 8" | 200 | 12.0 |
X-Slim Taper
| File Size | Length mm | Cross Section mm |
|---|---|---|
| 4" | 100 | 5.0 |
| 4 1/2" | 115 | 5.0 |
| 5" | 125 | 6.0 |
| 6" | 150 | 7.0 |
| 7" | 175 | 8.5 |
| 8" | 200 | 10.0 |
Choosing the right file size:
| TPI | File Size |
|---|---|
| <=4 1/2 | 8″ Slim or Extra-Slim |
| 4 1/2-6 | 7″ Slim |
| 6 1/2 – 8 1/2 | 7″ Extra-Slim |
| 8-9 | 6″ Slim |
| 9-10 | 6″ Extra-Slim |
| 10-11 | 5″ Extra-Slim |
| 10-12 | 4″ Slim or Extra-Slim |
| 11-14 | 4″ Extra-Slim |
| >=15 | Needle File |










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