uxcell Plastic Square Blanking End Caps Tubing Tube Inserts 38 x 38mm 5pcs Product Mame : Square Tube Insert;TotalSize : 39 x 39mm / 1.54"x 1.54"(L*W) Thread Size : 38 x 38mm / 1.5"x 1.5"(L*W);Overall Height : 17mm / 0.67" Material : Plastic;Color : Black Net Weight : 39g Package Content : 5 x Square Tube Insert