Veritas Aluminium Straight Edge Machined flat to the British standard of 0.075mm over the entire length Hour glass cross section for ease of handling With a reference edge machined flat to the British standard of 0.075mm over the entire length but weighing in at only 500g this 610mm aluminium straight edge with its hour glass cross section is easy to handle and stands well on the 11mm wide reference face to check the set up on your machine tables. Versatile as an important arbiter to flatness that you can trust, needed for so many set-ups and projects in the workshop.