uxcell Rectangle End Caps 38mm x 13mm Ribbed Tubing Tube Inserts 20 Pcs Product Mame : Square Tube Insert;Top Size : 38 x 13mm /1.5" x 0.5"(L*W) Thread Size : 37 x 12mm / 1.5" x 0.5"(L*W);Overall Height : 15mm / 0.6" Material : Plastic;Color : Black Net Weight : 60g Package Content : 20 x Square Tube Insert