This is a set of 2 sanding blocks, with both ends angled at 45 degrees.
These blocks work great for sanding up to areas like wheel openings. A standard square block tends to cut groves in these areas, since the corners cut into the radius.
One of the blocks is the standard 16 3/8" long and 3/8" thick, so it's fairly rigid. The other block is 12" long and 1/4" thick, so it is somewhat flexible.
***There may be up to about a 4 week lead time for this set.