1. Description: 1)Finger design restricts wire from slipping along the edge and creates two levels of wire service. 2)Easy insertion and removal of wire and cable. 3)With mounting holes for easy mounting. 4) Cable trunking provides excellent cover retention to combat appropriate vibration. 5)All duct comes complete with covers, but additional covers are sold separately. 2. Product Introductions: 1).Material: PVC Plastic 2).Apperance: Regular square, smooth, light, no impurity, beautiful Decent packaging 3).Color: Color pure, no have discoloration and aging 4).Smell: no scent, environmental 5).Use: For internal wiring, protecting the wire under 1200V 6).Effect: After using,wiring easily and trimly,installing reliably, and is convenient for maintaining and searching and exchanging 7).Lifetime: Anti-aging, normal use life can be up to 50 years