Tenders for Supply of Closed Height : 06 Mtrs, Extended Height : 11 Mtrs, Aluminium Wall Supporting Extension Ladder Manufactured From Aluminium C Shape Section Of Size- 66.6 Mml X 31.7 Mm W X 3.5 Mm T Confirming To He - 30 Grade T-6 Temper As Per Is: 733 And Aluminium 25 Mm Diameter Non Slippery Round Corrugated Tubing Fitted With Heavy Duty Safety Lock, Nylon Rope And Pulley And Rubber Pads At Bottom And Top End. Twist Proof And Unbreakable Performance. Make - Techoscient, Sumer, S J Ladders Or Similar Warranty Period: 30 Months After The Date Of Delivery