supply of plastic cover for calling on, route signal, shunt signal, 2/3/4 aspect signal, or a and agplastic cover for calling on, route signal, shunt signal, 2/3/4 aspect signal, or a and ag,supply of plastic cover for 2 aspect signal unit cover opened from front side and bottom side and madeof black polythene sheet of 100 micron thickness of size : 1200mm x 460mm x 205mm. on back s ide 75 mm widecorner to corner diagonal cross mark of silver colour of 100 micron thickness to be provided . tie up cover with signalunit suitable nylon rope of 5mm dia and 4 meter length to be provided on front sid e & of 1.5 mtr length at centre. note:-1. sample must be approved before bulk supply. 2. dimension are ap proximate to the extent of vary +-5%. [ warranty period: 12 months after the date of delivery ] ] , supply of plastic cover for 3 aspect signal unit cover opened from front side and bottom side and madeof black polythene sheet of 100 micron thickness size : 1300 mm x 460 mm x 205 mm. on back si de 75 mm widecorner to corner diagonal cross mark of silver color of 100 microne thickness to be provided tie up cover with signalunit suitable nylon rope of 5 mm dia and 4 meter length to be provided on front side and of 1.5 mtr length at centre.note:- 1- sample must be approved before bulk supply 2. dimension are ap proximate to the extent of vary +-5%. [ warranty period: 12 months after the date of delivery ] ] , plastic cover for calling on or a and ag marker signal unit opening form fron tside bottom side. x mark to be painted with white colour covering the entire back side. [ w arranty period: 12 months after the date of delivery ] ] , plastic cover for route signal unit opening form front side bottom side. x mar k to be painted with white colour covering the entire back side. [ warranty period: 12 months after the date of delivery ] ] , supply of plastic cover for 4 aspect signal unit cover opened from front side and bottom side and madeof black polythene sheet of 100 micron