Heller HSS Twist Drills With Reduced Shank - Heller 21554 1, This 16mm HSS twist drill from Heller has a reduced 10mm diameter shank which facilitates large-diameter holes in a small drill chuck and in hand drills.
Sold singly.
Heller 21554 1 0904 HSS Twist Drill With Reduced Shank 16mm - Single