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A high quality American-made jobber drill bit made by Triumph Twist Drill Co. These jobber twist bits are made of High Speed Steel to hold their sharp cutting edges longer, & have a bright finish. These twist bits are for general purpose drilling in a variety of materials. They will work well in hard & softwoods, aluminum, aluminum alloys, brass, bronze - soft & medium, & plastics. Made in the USA.
Triumph Twist Drill has manufactured High-Quality cutting tools for over 50 years. Starting in 1952, founder Harry Beck set out to provide customers with a product that the drill industry had been lacking. Harry, along with his son Jim and Cy Brock, decided to enter the small drill business and create quality, handmade products with the customer in mind.
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Drill Bit Size Decimal Equivalent Flute Length Overall Length Model 1 mm .0394 17 mm 41 mm 013910 2 mm .0787 25 mm 51 mm 013920 3 mm .1181 41 mm 70 mm 013930 4 mm .1575 54 mm 83 mm 013940 5 mm .1969 62 mm 92 mm 013950 6 mm .2362 70 mm 102 mm 013960 7 mm .2756 73 mm 105 mm 013970 8 mm .3150 81 mm 114 mm 013980 9 mm .3543 89 mm 124 mm 013990 10 mm .3937 95 mm 130 mm 013800 11 mm .4331 103 mm 140 mm 013810 12 mm .4724 111 mm 149 mm 013812 13 mm .5118 114 mm 152 mm 013814