Blade is hardened and tempered, stated blade length is from the inner edge of the stock to the blade tip.
Conforms to BS 939 grade B for squareness of:
External Edge of Blade to External Face of Stock
Internal Edge of Blade to Internal Face of Stock
16520 Specification:
Blade Length: 6in/150mm
Blade Width: 24.5mm
Blade Thickness: 1.6mm
Stock Length: 75mm
Stock Width: 24.0mm
Stock Thickness: 10.5mm
16521 Specification:
Blade Length: 9in/235mm
Blade Width: 32.0mm
Blade Thickness: 2.0mm
Stock Length: 128mm
Stock Width: 32.0mm
Stock Thickness: 19.0mm
16522 Specification:
Blade Length: 12in/310mm
Blade Width: 38.0mm
Blade Thickness: 2.0mm
Stock Length: 172mm
Stock Width: 36.0mm
Stock Thickness: 20.0mm