These are massive chisels for quickly wasting material from deep mortises. The 1/2" thick, high-carbon steel blades (Rc61) taper in width from tip to shoulder for sidewall clearance when cutting deep mortises.
The 6 1/2" hooped hornbeam handles are oversize for grip and have leather shock washers. About 13" to 14" long overall, these are hefty tools.
Made in Germany.