The Irwin 5026008 Straight Slow Spiral Flute Rotary Hammer Drill Bit is a high-quality masonry bit suitable for commercial, brick, cement, and block drilling applications. Made of durable metal and designed with a 5/16" diameter, this drill bit is 13" long and features a slow spiral flute for efficient drilling. With a California Prop 65 warning regarding cancer, this IRWIN-branded drill bit is a reliable and trusted tool for various drilling projects.