13mm x 13mm Plastic Square Cap Tube Pipe Inserts End Blanking 12 Pcs Product Mame : Square Tube Insert;Top Size : 13 x 13mm / 0.51" x 0.51"(L*W) Thread Size : 12 x12mm / 0.47" x 0.47"(L*W);Overall Height : 14mm / 0.55" Material : Plastic;Color : Black Net Weight : 12g Package Content : 12x Square Tube Insert