This insert is OEM for Generals Magnum and Certain Oliver spiral heads found in their line of Jointers and Planers.  It uses a 40 degree bevel which is different from the standard 35 bevel found on most 30x12x1.5 inserts.

Width=12mm

Length =30mm

Thickness=1.5mm

Bevel: 40 degrees

Part # 543241

Plastic Case includes  10 knives

Made in Germany