Size 37 HSS Drill Bits
Buy out from Union Butterfield 30 years ago.
They have been bought out by Precision Twist.
We have over two million drill bits in stock
Union Butterfield – Made in America Since 1895
With roots dating back to 1895, Union Butterfield is recognized as the leading North American brand of HSS general line threading tools. Always proud to be
Made in the USA, your Union Butterfield selection of cutting tools represent quality and cost-effective reliability.
