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.
Doesn't work very well on a brick exterior wall. The beats kept getting hotter and I had to stop. It took me almost 2 days just to drill 4 small screw holes.
Mostly excellent, except for the smallest. The smallest piece broke about halfway down the shaft rendering it completely unusable. And the rest is good! Very helpful considering I live in an old building with very solid brick/concrete walls.