These boring bits are designed for accurate boring and the two wing cutters and two spur cutters prevent bottom side tear out. Boring bits are supplied with a 10mm shank with an adjustable top screw making them compatible with most boring machines. The 3557E is designed with a 3/8" shaft to fit in most drill presses.
Warning: SOME PRODUCTS WE SELL MAY CONTAIN ONE OR MORE CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR REPRODUCTIVE HARM. For more information please visit https://oehha.ca.gov/proposition-65