The Imperial six-piece primary set includes 1/16″, 1/8″, 1/4″, 1/2″ and 3/4″ thick 2″ long blocks made of anodized aluminum plus a steel 1 2 3 block (so named for its 1″ × 2″ × 3″ size). The aluminum blocks are accurate to within 0.002″, while the steel block is accurate within 0.0002″. Combined, they stack from 1/16″ to 4 11/16″ in 1/16″ increments.
As a supplement to the primary blocks, two Imperial expansion kits are available to simplify setting fine fractional measurements. The seven-piece expansion set includes 3/16″, 5/16″, 3/8″, 7/16″, 9/16″, 5/8″ and 11/16″ sizes. Having the primary and seven-piece sets means you can work with the exact block size you need when working in 16ths up to 3/4″; they can also reduce the number of blocks required when setting up larger combinations.
For those who frequently work in 32nds of an inch, the six-piece expansion set includes 1/32″, 3/32″, 5/32″ and 7/32″ blocks plus 15/32″ and 23/32″ blocks that match the thickness of nominal 1/2″ and 3/4″ plywood. All blocks are 2″ long, made of anodized aluminum and accurate to within 0.002″. A set of all 19 Imperial blocks is also available.
The metric set of nine includes three vinyl shims (two 0.5mm and one 1mm thick), 2mm, 4mm, 8mm and 16mm thick aluminum blocks (a second 16mm thick block is included to simplify 32mm spacing ) and a 25mm × 50mm × 75mm steel block. The shims and aluminum blocks are accurate to within 0.05mm and are 50mm long; the steel block is accurate to within 0.018mm. Combined, the set allows stacking from 0.5mm to 123mm in 0.5mm increments.
The Imperial primary and seven-piece expansion sets and the metric set come in a hardshell plastic case with dividers to protect the blocks; the case for the seven-piece set has extra space to accommodate the six-piece expansion set (which alone does not include a case).
Made in Canada.