Simpson Strong-Tie #10 x 1-1/2-in Mechanically Galvanized Strong-Drive SD Exterior Wood Screws (100-Per Box) in the Wood Screws department at Lowes.com
How to use threaded screw inserts in Hard wood - YouTube
Select Wood Pole Connector Screw For Drapery Poles
Kirsch Wood Pole Connector Screw
Lot of 2 Kirsch Wood Pole Connector Screw 2" Double Ended Screw NOS 27837218804 | eBay
Simpson Strong-Tie #10 x 2-1/2 in. 1/4-Hex Drive, Strong-Drive SD Connector Screw (100-Pack) SD10212R100-R - The Home Depot
Brass Screw Joints for Wood Poles - Chrome Plated - 1 1/4"