Tube End Cap - TOOGOO(R) 10 Pcs Plastic Square Blanking End Cap Tubing Tube Inserts 38mm x 38mm Product Mame : Square Tube Insert Cap Top Size : 38 x 38mm / 1.5" x 1.5"(L*W) Bottom Size : 31 x 31mm / 1.1" x 1.1" (L*W) Over Height : 18mm / 0.7"