Sun's Tea Stainless Steel Deep Infuser (for all 18oz Sun's Tea Tumbler or 21oz Shaker Bottle) This deep strainer is made for Sun's Tea 18oz Double wall Glass Tea Tumbler, 18oz Drink-hole Traval Mug, or 21oz Glass Shaker Easy to use, simply push the strainer on the 18oz tea tumbler or lift it when the brewing is done. 3-inch deeper than the original click-on strainer very fine filter hole allow to prepare power loose tea. Made of stainless steel, dishwasher safe.