COMPATIBILITY: Designed for 22LR .223 & 5.56 PACKAGE CONTENTS: Set includes 6 thread protectors PROTECTION: Guards against dirt, debris, and impact damage while preserving the integrity of your barrel threads, Quick hand-tightening design allows for simple attachment and removal when needed PRECISE FIT: Manufactured to exact 1/2 x 28 specifications for secure attachment and reliable thread protection EASY INSTALLATION: Quick hand-tightening design allows for simple attachment and removal when needed