a)Parallel Rules b)SIZE:450MM,600MM c)IMPA: 371001 d)Available in plain or with semi circular protractor e)Designed forChart Parallel Rules:CODEDESCRIPTIONUNITIMPA 371001Parallel Rules 450mmpcsIMPA 371002Parallel Rules 600mmpcsParallel Rules 450mm(IMPA code 371001),Parallel Rules 600mm(IMPA code 371002),