Stand Adapter, 1/4''-20F to 3/8''m, 20mm Long - 088 | Manfrotto US
Amazon.com: Niewalda 1/4 Inch Male to 3/8 Inch Female Tripod Screw Adapter 3 /8 to 1/4 Tripod Adapter Mount Screws, Accessories for Camera/Tripod/Monopod/Light Stand : Electronics
3/8" to 1/4" 1/2 inch Drive Ratchet Converter Socket Adapter Reducer Air Imp GA | eBay
Impact Female 1/4"-20 to Male 3/8"-16 Thread Adapter CA-109 B&H