Rectangle End Caps Ribbed Tubing Tube Inserts 50mm x 25mm 12pcs Black Product Mame : Square Tube Insert;Top Size : 50 x 25mm / 2" x 1"(L*W) Thread Size : 50 x 23mm / 2" x 0.9"(L*W);Overall Height : 17mm / 0.7" Material : Plastic;Color : Black Net Weight : 80g Package Content : 12x Square Tube Insert