Century 81148 SDS Masonry Drill Bit, 3/4-Inch by 12-InchProduct Features Heavy duty grade carbide tip for hardness and durability. High-temp copper brazing reduces the risk of losing carbide tip during difficult drilling applications. Heat treated body to assure stability and uniformity from tip to shank. Small land and wide flute design for less heat build up and maximum debris removal, to greater drilling performance. Positive drive slot shank fits all popular SDS drills.
I thought it would be bad quality, because it costs only 27.64 . But I surprised, because amazingly it's very good product, maybe best Century Drill And Tool Sds Masonry Drill Bit Size: 0.75 Bu 12!