uxcell Plastic Square Tube Inserts End Blanking Caps 19mm x 19mm 5 Pcs Black Product Mame : Square Tube Insert;Top Size : 19 x 19mm / 0.75&rdquo; 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 : 16g Package Content : 5 x Square Tube Insert