This product makes passages in walls or ceilings of buildings so that diverse pipes or electric wires can penetrate them.   Builders working with existing products had to buy sleeves of various heights depending on height of building concrete.    With this product, height of sleeves can be adjusted easily and instantly facilitating positive construction and helping inventory management. (vg1, vg2 combined use)

Invention patent: No. 10-0662707

Materials : PP(Kopelen)