A flat, unbroken spine from handle to tip with all the curve in the edge. The oldest knife profile there is, and it puts the most steel behind the spine of any shape.
Knives
3
Blade range
3.5″–3.99″
Weight range
2.7–3.4 oz
The shape across the size range
01234567 in
Cold Steel Finn Wolf · Straight Back
3.5″ blade · 0.118″ spine · 3.4 oz · ~0.82″ tall (derived) · family outline
Boker Plus Kwaiken Air · Straight Back
3.54″ blade · 2.93 oz · ~0.77″ tall
Spyderco Stretch 2 XL Lightweight · Straight Back
3.99″ blade · 0.118″ spine · 2.7 oz · ~0.93″ tall (derived) · family outline
Spine thickness, same scale
0.118″
0.118″
Length and spine thickness drawn to true scale from published specs. Outlines traced from makers' photos, except where marked as the shape family's.
