Single Sided Stainless Steel Folding Rule Metric - 600mm 600FMSingle sided with graduations on both upper and lower edges with numerical markings in centre only Toledo folding rules are precisely manufactured to maximise reliability and smooth operation Blades are locked into place when straightened via an accurately machined rivet function Blades straighten and align perfectly to maintain accurate graduations and measurements One square end and one round end when not fully extended. Square end to square end at