https://www.acehardware.com/departments/tools/power-tool-accessories/drill-bits/2487510
Klein Tools 3.15 in. L High Speed Steel Step Drill Bit Hex Shank 1 pc Mfr# KTSB11 - Ace Hardware
These Double-Fluted Step Drill Bits provide faster cutting and drilling than single flute bits. The easy-to-read step markings and targets save time when...