Marshalltown 1-ft to 1-ft Threaded Extension Pole in the Extension Poles department at Lowes.com
Kraft Tool Concrete Broom Thread to 1-3/8" Button Handle Adapter
Broom Handle Adapter by LoboCNC | Download free STL model | Printables.com
Amazon.com: Elesunory 6Pcs Threaded Tip Replacement, Ultra Threaded Tip Repair Kit, Metal Broom Handle Adapter for 0.98 Inch Wood or Metal Poles : Industrial & Scientific
Lacquered-Wood Threaded-Tip Broom/Sweep Handle, 0.94" dia x 60", Natural - ASE Direct
Sartatue Thread Tip Replacement,Ultra Threaded Tip Repair Kit 0.8 Inch Extension Pole Adapter Tips Metal Threaded Handle Tips for Mop Broom Brush (0.8 Inch-2PCS) - Amazon.com
Anvil 1-3/8 in. Male Threaded to Button Handle Adapter 57537 - The Home Depot