HSS Titanium Spiral Grooved Step Drill Bit Set
5 piece step drill bits set replaces 50 individual drill bits which saves you a lot of trouble and space,Two-flute design gives you faster, smoother cutting. Large bit has 3-sided shank and small bits have hex shank to prevent slip in drill chuck
https://amazmerch.com/hss-titanium-spiral-grooved-step-drill-bit-set/
https://amazmerch.com/hss-titanium-spiral-grooved-step-drill-bit-set/