uxcell Plastic Square Pad Tubing Tube Insert Blanking End Caps 19mm 4 Pcs Product Mame : Square Tube Insert;Top Size : 19 x 19mm / 0.75" x 0.75"(L*W) Bottom Size : 18 x 18mm / 0.71" x 0.71"(L*W);Over Height : 18mm / 0.75" Material : Plastic;Color : Black Net Weight : 12g Package Content : 4 x Square Tube Insert