Accurately machined from solid brass. The Axminster Woodworker's Gauge Block Set consists of six 25mm diameter blocks with heights of 16, 8, 4, 2, 1.5 and 1mm. Used singly or in various combinations, these give an accurate guide from 1 to 32.5mm (except 32mm). Used for setting other gauges, testing widths of grooves, mortices and so on or fences to fine tolerances. This is another of those 'how did I ever manage without it' tools. Supplied in a velvet lined presentation box to keep it well out of harm's way when not in use.