2 x Pulse M20 Speaker Mount Plate M20 Thread - DY Pro Audio
M20 Threaded Pole Mount Cup - Carvin Audio
POLE-GA Gas Assist Speaker Pole with M20 Thread | JBL | Leisuretec
JB Systems - SPEAKER POLE (M20 thread) - Stands Speaker
Amazon.com: On-Stage SS7746 Subwoofer Pole with M20 Thread (for Mounting a PA Speaker Above a Sub Cabinet, 1 3/8” Mount with Optional M20-Threaded Stem, 100 lb Capacity, Adjustable Height, Steel, Black) :
HK-Audio K&M Speaker Mounting Pole M20 Pack « Accessories for Loudspeakers