The Bahco 3942-228-7-SL Reciprocating Blade for Plaster & Board has the following specification:

Length: 228mm
Teeth: 7 TPI
Thickness: 1.1mm
Pack Quantity: 5

Pack of 5 Bahco 3940-150-18-HST Heavy Metal Reciprocating Blades 150mm 18 TPI

The Bahco Wood & Metal Bi-Metal Reciprocating Blade has been designed for demanding cutting in wood, even with embedded nails, but it can also be used for thick metal materials.

Made from virtually unbreakable Sandflex® bi-metal with precision ground teeth. Thicker blade design with a sloped, narrow nose that makes it easy to use in narrow places but still rigid. It also has a higher resistance to fracturing and bending, allowing straighter cuts.