The bahco 466 series levels have a unique design on the radius end caps fastening pins and convex radius they have two vertical plumb vials and one horizontal vial with an accuracy of 05 mm m the thick 17mm profile construction will not twist and it has a v groove at the bottom making these levels ideal for use on pipes machined surface on top and bottom anti shock rubber end caps laser edged centre zero measuring scale along the edge anodised finish 2 hand holes only 1 on 400mm