This Clarke measuring tool set includes square, centre, and protractor heads with (12) stainless steel rule. Measuring heads lock onto the rule for precise square, centring and angular alignment. - Square head sets rule to 90 or 45 to edge, - Centre head locates centres accurately on round sectionsProtractor head 0-180 scale (graduated every 1 degree) measures angles to an edge and includes spirit level - Spirit level - 45 mm long steel scriber
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