[salad]

I have a brick wall, about a 1/2 foot high, that used to surround a
playset that got burned down. The brick wall had 2x10 boards on the top
of the wall that created a ledge.

There's metal bolts in the brick to hold the board down. In the current
burnt boards, the person that built it put a "sink", for lack of better
terminology where each bolt was located. IOW, a round hole was cut in
the board at each bolt location that went about 1 inch deep. I guess
this was done with a hole saw.

Let's say the holes were 2 inches in diameter, cut 1 inch deep, then the
next inch drilled creating a hole the bolt can slip thru. When I
tighten the bolt, the bolt will rest at the bottom of the 2 inch hole
cut I made.

If I cut a circle in the board and cut 1 inch down, how do I get that
piece out of the board? Do I use a chisle? Or do hole saws permit me
to create a "sink" that won't go thru the entire board?

Thanks for any advice you can provide.