1/2" Thread Protector.

1/2" UNF thread fits most threaded barrels.
2 thread lengths available -
14mm thread length. 22mm overall length.
20mm thread length. 28mm Overall length.

14mm length thread protector is suitable for our 1/2" unf barrel adaptors.
Suitable for both .177 and .22 calibres.
18.0mm outside diameter.