1) ONE BIT FOR ALL: High-visibility silver targets for primary 19 hole sizes; come with 19 sizes (3/16", 9/32", 3/8", 7/16", 17/32", 5/8", 11/16", 25/32", 7/8", 29/32". 31/32", 1", 1-1/16", 1-1/8", 1-5/32", 1-7/32", 1-9/32", 1-5/16", 1-3/8") so you can drill up holes with different diameters, saving your time and efforts to change bits.
2) DURABLE & STURDY: Solid M2 high speed steel construction for extra durability, the unique thick 3/8 inch hex shank prevents slip in drill chuck and reduces shocks, for a more positive grip.
3) HIGH PERFORMANCE: Double-Fluted Step Drill Bits provide faster cutting and drilling than single flute bits, it is optimized for cordless drills in high speed provides greater speed and control.
4) CONVENIENT & ACCURATE: Easy-to-read step rings save time when drilling common holes, laser-engraved marks, offer superb convenience and accuracy, for fast, easy hole size identification.
5) UNIVERSAL COMPATIBILITY: Compatible with 1/4, 3/8, 1/2 electric drills or bench drills, work for sheet steel, metal, aluminum or plastic, designed for drilling on steel plates up to 0.2 in. thickness.