1/4 to 1/4 Screw Adapter - For Camera / Tripod / Photo / Video : ID 2632 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Hillman 1/4-in x 1/2-in Zinc-Plated Coarse Thread Hex Bolt in the Hex Bolts department at Lowes.com
Camera Mount 1/4 Inch Screw Tripod Area Screw Adapter 20-thread Stainless Steel For Dslr Camera Tripod Quick Release Plate - Photo Studio Kits - AliExpress
1/4-20 Socket Head Cap Screws Stainless Steel Allen Bolts All Lengths Quantities | eBay
1/4" x 1 1/2" SS Lag Screw | Agri Sales Inc
Everbilt #10-24 x 1/4 in. Phillips Flat Head Zinc Plated Machine Screw (10-Pack) 803831 - The Home Depot
Everbilt #2 x 1/4 in. Phillips Flat Head Zinc Plated Wood Screw (8-Pack) 806761 - The Home Depot