TEST SETUP
We compared two LeGrand thread snips on the same button of an actual shirt.

BUTTON
Diameter:
0.39 in (10 mm)
Condition:
Tightly sewn, with limited clearance beneath the button

TOOLS TESTED
Japanese Short Thread Snips for Sewing – High-Carbon Stainless Steel 4"
Overall length: 4"
Blade length: 1.46"
Japanese Long Thread Snips for Sewing – High-Carbon Stainless Steel 4"
Overall length: 4"
Blade length: 1.9"
Top: Long Thread Snips · Bottom: Short Thread Snips

WHAT WE TESTED
We compared how easily each pair of thread snips could be guided beneath the button and brought into position around the threads.
The test focused on access and handling.
HOW WE TESTED
Each pair of thread snips was tried twice by hand on the same shirt button.
EVIDENCE
SHORT THREAD SNIPS

The 1.46-inch Short Thread Snips blades could be positioned beneath the tightly sewn 0.39-inch (10 mm) button.

The Short Thread Snips beneath the same button, seen from a lower angle.
LONG THREAD SNIPS

The 1.9-inch Long Thread Snips blades extended farther beneath the same button.

The longer blades extending farther beneath the same button.