Telescopic extension are a for telescoping ladder use. The is easy to install and use. Simply remove the old locking pin from your ladder and replace them. The is designed to fit most telescoping ladders, can be sure that it will work with your ladder.Features-Color:Black-Material:Plastic-Size:3.40X3.00X1.50cm/1.34X1.18X0.59in- The is safer, won't rust or corrode over time, which can weaken the locking mechanism.- With the plastic , you can be sure that your ladder will stay in place and keep you safe while .- The telescoping ladder plastic is easy to install, lightweight, and making it a choice for anyone who needs to use their ladder for work.- Extension ladder plastic are safe to lock, can increase the safety of ladder more effectively.- Push inward for retracting ladder, lift ladder universal replacement accessories are of wide application.Package list: 4 x telescoping ladder plastic