m42-m39 10-15 Adjustable Focusing Helicoid Adapter for M42 to M39/L39 Mount
Features: brand new and

Front mount: M42 screw mount female (M42 x 1mm).
Length: 10mm to 15mm (5mm movement distance for focusing).
Material: aluminium alloy.
Rear mount: M39 screw mount male (M39 x 1mm).

Specifications: Front mount: M42 screw mount female (M42 x 1mm)
Rear mount: M39 screw mount male (M39 x 1mm)
Length: 10mm to 15mm (5mm movement distance for focusing)

Material: aluminium alloy.

Package Includes: 1 x Focusing Helicoid

note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.
Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!