Easy to install, replacement for the old or damaged one, reliable to use.
Various sizes of 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm are suitable for different .
Electronic caliper adopts satisfactory grinding procedure and it additionally continues excessive 8209;end strong chip.
Thread specification---: the internal thread specification of the interface is m42x0.75mm, and the outside thread specification is m42x0.75mm.
Diy as you like---the required spacing may be executed by way of combining numerous extenders of differing lengths,you can use 1 piece, 2 portions , three portions or 4 pieces of the extension rings as you want, and those m42 extension tubes microscope accessories can help to put off a range of focusing problems.