●Used for inspection of R (radius) of workpieces, molded products, molding die, blade and the like.●Outer diameter round, for groove roundness.●Dimension (mm):210 x 50●Set Details (mm):2 sheets each: 24.0 to 30.0(per 1.0)●Number of Sheets (sheets):14●Uneven (Male/female) independent type●Cold rolled steel