Teslong 5-Mirror Set
Teslong 5-Mirror Set for Rifle Borescopes - These fit on Teslong NTG100-series borescopes, and include 5 mm, 6 mm, 7 mm, 8.5 mm, and 10 mm diameters to fit .22, .243, .30, .38, .40 caliber, and more barrel sizes. These mirrors are NOT compatible with the NTG200 Focus & Fold borescope.
This set includes one of each diameter side-view mirror:
0.2 in (5 mm)
0.23 in (6 mm)
0.27 in (7 mm)
0.33 in (8.5 mm)
0.39 in (10 mm)
This kit allows you to see more of the lands and grooves inside of large-caliber rifle barrels than you would with just the standard 0.20 in diameter mirror.
These mirrors also help keep your borescope centered inside the barrel and thus maintain a more consistent focus as you rotate the borescope probe.