Black (Ssa21) On-Stage M20 Subwoofer Adapter Product Details The On-Stage SSA21 Subwoofer Adapter's female M20 threading attaches to M20 speaker shafts to accommodate virtually any subwoofer on the market, utilizing both removable M20 threading and a tapered, zinc-lugged lower section to accept 1 " cups. Whether it is a shallow M20, recessed M20, 1 3/8 cup or 1 3/8" cup with M20, the SSA21 will fit your subwoofer. Provides speaker shafts with M20 universal subwoofer adaptability 1 3/8" taper and removable M20 lug eliminates wobble and makes for a universal fit for all subwoofers on the market Solid steel construction item package weight: 1.0 pounds Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.