2 1/2" x 3 1/2" x 2 1/2" x 1/2" thick    with one  5/8" hole and one 1/2" hole and two  clipped corners     Qty 1

3 x 3 x 3  with 1 slot only     3/8" thick        Qty 1

3 x 3 x 3 x 3  with slot and one  1/2" hole    3/8" thick     Qty 2

Slots are 1/2" by 2"