COUNTERSINK 25.0mm x 6.3mm 60° HSS SS 3 FLUTE DIN334 - 
PRESTO UK

Diameter - 25mm
Type - 60° HSS Countersink
Overall Length - 71mm
Shank Diameter - 10mm Plain Shank
Material - HSS 
Spec - DIN334
Manufacturer - Presto UK since 1843
Part Number - 78011