"cement Concrete Grade M-20 (nominal Mix) With 20 Mm Maximum Size Of Stone Aggregate"-providing And Laying In Position Plain Cement Concrete (pcc) Of Specified Grade Excluding The Cost Of Centering And Shuttering, Steel Work Welded In Built Up Sections/ Framed Work Including Cutting, Hoisting, Fixing In Position And Applying A Priming Coat Of Approved Steel Primer Using Structural Steel Etc. As Required. In Stringers, Treads, Landings Etc. Of Stair Cases Including Use Of Chequered Plate Wherever Required, All Complete.