Toolcraft hss countersinks 90 6 3 8 3 10 4 12 4 16 5 20 5mm set of 6 toolcraft 821394 this set of hss countersinks from toolcraft features 6 high quality set of 3 flute countersink bits that have been designed for countersinking and deburring toolcraft 821394 hss countersinks 90 6 3 8 3 10 4 12 4 16 5 20 5mm set of 6