The Bahco 466 series levels have a unique design on the radius, end caps, fastening pins & convex radius. They have two vertical (plumb) vials & one horizontal vial. (only 1 vertical vial on 400mm) with an accuracy of 0.5 mm /m. The thick 1.7mm profile construction will not twist & it has a V groove at the bottom making these levels ideal to be used on pipes. Machined surface on top & bottom. Anti-shock rubber end caps. Laser edged centre zero measuring scale along the edge. Anodised fin