In this lot  

5 x CS02  HSS Countersink               08.3mm  

2 x CS20  Carbon Steel Countersink 10mm  

3 x CS04  HSS Countersink               12.4mm   

4 x CS22  Carbon Steel Countersink 16mm  

2 x CS23  Carbon Steel Countersink 19mm  

They mostly appear to be rose flute, 90 degree for wood and plastics , with 6 or 8mm round shanks.