You are Buying a Brand New And factory Sealed Milwaukee 3-9/16 in. x 11-3/8 in. SDS-MAX Core Bit For brick Model # 48-20-5428..... Core bit cut with the outer cutting edge only. The inside core must be removed to allow for deeper hole drilling applications beyond 3". Centering bit 48-20-5495 (included) is recommended for exact spot drilling and to avoid bit wandering during use. The drift key 48-20-5497 (not included) allows for easy removal of the centering bit. The one piece core bits are available in SDS-Max or Spline shanks, ranging from 1-1/2" to 6" diameters and overall lengths of 11-3/8" or 22", with a drilling depth of 3". Asymmetrical and Alternating Teeth for up to 20% faster drilling speeds. Thick-Wall Core Body for Durability Even in Large Hammers. Includes centering bit (48-20-5495) to allow exact spot drilling and reduce bit walking. Drift key (48-20-5497) sold separately for easy centering bit removal. Ideal for brick, block, and concrete applications.....