Check the listing for details. WOODRIVER Project Kit - Silicone Bottle Stopper Black. Condition: New. Listed at 7.49 USD. NEW, WOODRIVER Project Kit - Silicone Bottle Stopper Black, 160765, Build it yourself!, Kit requires a 1-1/2" x 1-1/2" x 2-1/2" turning blank (sold separately), Equipped with a 3/8"–6 TPI x 7/16"-long threaded stud, 2-1/2" overall length, WoodRiver® Silicone Bottle Stopper Kit is constructed from solid 100% food-safe silicone, so cross contamination will not be an issue, and the kit will fit securely in any bottle. This kit includes a 100% food- and pharmaceutically-safe solid stainless steel trim ring that will provide a firm shoulder for your turning to rest upon. Turning kit requires a wooden or man-made blank, 11/32" bit, and mandrel, all sold separately. After drilling the 11/32" pilot hole, thread the blank snug and flush to the base of the stopper.Features: • 100% food-safe.