Square Tubing Tube Insert Caps Covers 20mm x 20mm Threaded 40 Pcs Product Mame : Square ThrededInsert;Top Size : 20x 20mm / 0.7" x 0.7" (L*W) Bottom Inner Size : 13 x 13mm / 0.5" x 0.5" (L*W); Thread Size: 18 x 18mm / 0.7" x 0.7" (L*W); Over Height : 25mm /1" Material : Plastic;Color : Black Net Weight : 162g Package Content : 40 x SquareThrededInserts