Niwaki RulerHardened stainless steel metric rulers from the Matsui Precision Manufacturing company, for draughtsmen, engineers and carpenters everywhere. Slightly sturdier than your average stainless steel ruler, with a natty yellow vinyl slip case and conversions tables engraved on the reverse (inches mm, tap drill mm, and W. W. UNF thread mm): needless to say, they wont let you down. Although still in use amongst artisan craftsmen and other traditionally minded