slack crater Rational 21 64 drill bit in mm nice to meet you Numeric Blacken
Milwaukee 48-89-2218 21/64" Thunderbolt Titanium Twist Drill Bit
Dormer 21/64 in 2 Jobber Drill 5967460, Right Hand Cut, Split Point 118° Point, Bright/TiN Finish, 117 mm Overall Length, 4 x D Standard Spiral Flute, High-Speed Steel | RSHughes.com