This set includes a 22" long beam block, an 11" long round handle block, an 8 1/2" flat block
All block bases are machined from 6061 T6 aluminum. The 22", the 11" and the 8 1/2" all feature a rounded edge on the sanding surface of the block base.
These are designed to stay straight! They won't bend, flex or warp. They use any PVA/Stik It style sand paper.
When it has to be straight, these are the blocks you "GoTo"