49/50 x 1/4 HSS Rose Countersink
90 degree Rose pattern countersink produced in HSS and should not be confused with carbon steel types.
They are designed for countersinking mild steel, iron and plastics.
Ref 49 / 50 is made from special grade HSS and can be used at high speeds ( up to 10,000 rpm).
It is popular for countersinking aluminium alloy.
HSS.
1/4in Shank.