40x31mm classic black hollow joist
Joist is used to support and fix WPC decking.
Length：2.2m, 2.8m, 3m, 5.6m or customized
Main material：60%Wood fiber + 30%HDPE + 10%Additives
Application：Garden, backyard, swimming pool, balcony, terrace, hallway, farm
Surface treatment：No deal with
