M42 to M42 mount lens Adjustable Focusing Helicoid Adapter 25mm to 55m – Roxsen.com
Focusing Helicoid Adapter, Set Lens Adapter, M52 to M42 , Mount Lens ,Aluminium Alloy, M52 to M42 -55mm 25-55mm - Walmart.com
M42-nex/m Pixco Adjustable Focusing Macro Helicoid Adapter Tube Suit For M42 Lens To Sony E Mount Camera Nex A5000 A3000 5t 3n - Lens Adapter - AliExpress