Blue Ribbon™ High Speed Twist Drills, Sets
Jobbers length twist drills made of the finest high-speed steel. Heat treated to a hardness of 63–65 HRC and precision-ground to a tolerance of +.0000 to –.0003″. Can be used on all metals. Made in USA.
Set of 12 includes drill numbers: 55, 57, 60, 62, 64, 65, 66, 68, 70, 72, 73, and 75.
Set of 20 includes drill numbers: 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, and 80.
