Setting up machines can be a frustrating and inaccurate undertaking. Tape measures and rulers are difficult to use when measuring gaps between curved bits and guide fences. Worse, machines often require two hands to adjust, leaving nothing to hold the measuring tool being used. The Set-Up Blocks help solve this problem. Simply place the appropriate block or combination of blocks between the fence and bit or blade and adjust accordingly.The set includes five 2" long anodised aluminum blocks 1/16", 1/8", 1/4", 1/2" and 3/4" thick, accurate to within 0.002", plus a steel 1-2-3 block (so named for its 1" x 2" x 3" size), accurate to within 0.0002"! Combined, they stack from 1/16" to 4-11/16" in 1/16" increments. The set is supplied in a hard-shell plastic case with dividers to protect the blocks.Made in Canada.