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The problem with one piece bits is that they are easily broken if dropped on the hard floor. This Connecting Screw Step Drill is designed so that you can easily replace the brad point drill when when it is damaged or worn out. Shank is 1/4" hex, and fits most quick change chucks as a bonus! Note: for best results and longest life, clear the chips often when drilling. Made in USA.
Features: • Connecting Screw Size: 5 x 40mm • Shoulder Diameter: 7.62mm • Clearance Diameter: 5mm • Pilot Diameter: 3.5mm