Narex Premium Bevel Edge Chisel Set - 4 Piece Asahi The two standard discs have

The two standard discs have a radius of 3 mm (1/8") and a 60 degrees tip

The degree of off-set determines the pitch of the spiral

Easy one-hand setting

The cutter is constructed from 01 high carbon steel

The back of the Stanley packet says:

Narex Premium Bevel Edge Chisel Set - 4 Piece Asahi The two standard discs haveDesigned for cutting with mallet or paring by hand. The Bevel edge allows for work in tight spaces Stained hornbeam wood handle Blade is forged from highly alloyed Cr Mn steel and heat treated up to 59 HRc. thin sides for sidewall clearance fully ground and sharpened Set consists of 1 x 1" (26mm), 3 4" (20mm), 1 2" (12mm), 1 4" (6mm) Inovated chisel with improved cross section of the blade that minizes friction when cutting into wood. Improved