Alro Steel Super Square pre-squared blocks. Choose from 2, 4, or 6 side precision milled. Square within .002 of an inch. Super Square is available in Tool Steel, Cast Iron, Stainless Steel, Aluminum, Alloys, Carbon, Copper, Brass, Bronze. Minimum Size is .25” x .75” x .75”. The maximum size is 15.75” x 39.375” x 39.375”. Learn more on our website at • Video