Introducing the versatile and durable 1/8 to 1/2 by 1/32 Increments Unibit, HSS Step Drill Bit. Made of high-speed molybdenum steel, this industrial-grade tool is heat-treated for long-lasting use. With a self-starting tip and exclusive concave flute design, it creates perfectly round holes in various materials without the need for center punching. Keep your projects moving smoothly with this sharp and efficient step drill bit.