uxcell Plastic Square Blanking End Cap Tubing Tube Inserts 30mm x 30mm 20 Pcs Product Mame : Square Tube Insert;Top Size : 30 x 30mm/1.20 Inch x 1.20 Inch(L*W) Mouting Size : 29 x 29mm/1.14 Inch x 1.14 Inch(L*W);Over Height : 20mm/0.79 Inch Material : Plastic;Color : Black Net Weight : 113g Package Content : 20 x Square Tube Inserts