Check the listing for details. On-Stage SSA20M Speaker Mount Adapter with M20 Threading. Color: Black, Condition: New. Listed at 19.89 USD. On-Stage SSA20M Speaker Mount Adapter with M20 Threading Features: Replaces existing 1 3/8" sockets M20 threading provides wobble-free connection between the subwoofer and compatible speaker poles Includes four mounting screws Description: Product Description Upgrade your subwoofers! Replace existing 1 3/8" Sockets with the SSA20M Threaded speaker Adapter. Designed to be a direct replacement for most socket mounts; simply remove and replace. M20 threading provides a rock-solid, wobble-free connection between the subwoofer and compatible speaker poles. Perfect for use with the SS7746 adjustable subwoofer shaft. From the Manufacturer Upgrade your subwoofers! Replace existing 1 3/8" sockets with the SSA20M threaded speaker adapter. Designed to be a direct replacement for most socket mounts; simply remove and replace. M20 threading provides a rock-solid, wobble-free connection between the subwoofer and compatible speaker poles. Perfect for use with the SS7746 Adjustable Subwoofer Shaft. Payment: We accept PayPal and all major credit cards. “Buy It Now” items require immediate purchase. Shipping: Most items ship within 1 business day of received payment. Shipping is free unless you upgrade your shipping speed at checkout. You will receive tracking information within 48 hours of shipment. Returns: If you need to return your purchase, please do so within 30 days of receiving your item. Please contact us for an RMA number. We will not accept returns without an RMA number.