This hammer expander has an ambidextrous fit which provides easy cocking for left or right hand at all times. Works with Henry rifles. Other features include easy installation, helps prevent uneven wear of trigger and sear surfaces, and has a knurled body that affords positive non-slip cocking, can be used with or without telescopic sights, and has a hard anodized finish. Backed by Carlson’s lifetime warranty and is made in the USA.