Carbide Imported Hex Shank can be Used with a Quick Change Adapter, Allowing You to Change Bits in Half the Time Includes One Each of the Following Bit Sizes: 5/32", 3/16", 1/4", 5/16" & 3/8" Masonry Bits have Embedded Carbide Tips 1/4” Hex Shaped Quick Change Shank Dimension Retention Groove in Bit Shank to Keep Bit From Falling Out