[Class : 19] Prefabrication And Manufacturing Of Concrete Elements Like Precast Solid Concrete Slabs (Steel Or Gfrp Reinforced), Precast Box Culverts, Precast U Drains, Precast Kerbs, Precast Saucer Drain, Precast Footpath Tiles, Precast Chambers And Other Small Items Of Any Grade Of Concrete For The Purpose Of Making Roads, Drainage And Footpath.[Class : 37] Services Provided For Installation, Erection And Laying Of Prefabricated Concrete Elements Like Precast Solid Concrete Slabs (Steel Or Gfrp Reinforced), Precast Box Culverts, Precast U Drains, Precast Kerbs, Precast Saucer Drain, Precast Footpath Tiles, Precast Chambers And Other Small Items Of Any Grade Of Concrete At Various Places With Different Types Of Machineries.