30mm x 30mm Plastic Square End Caps Tube Pipe Ribbed Inserts 12 Pcs Product Mame : Square Tube Insert;Top Size : 30 x 30mm / 1.2" x 1.2"(L*W) Thread Size : 29 x 29mm / 1.1" x 1.1"(L*W);Overall Height : 18mm / 0.71" Material : Plastic;Color : White Net Weight : 62g Package Content : 12 x Square Tube Insert