uxcell Plastic Square Blanking End Caps Tubing Tube Inserts 30mm x 30mm 4 Pcs Product Name: Square Tube Insert; Top Size: 30 x 30mm/1.2" x 1.2"(L*W) Bottom Size : 28 x 28mm / 1.1" x 1.1"(L*W);Overall Height : 20mm / 0.78" Material : Plastic;Color : Black Net Weight : 24g Package Content : 4 x Square Tube Insert