SEELSKREWS® are designed to seal out air, water, lubricants and other liquid or gaseous contaminants. They can also be supplied with either self-locking pellets, strips or patch, anti-seizing coating, a black oxide, painted heads, or in a captivated (KAPTO-SKREW®) configuration. Sheet metal and other type fasteners available on special order.To assure maximum sealing performance of SEELSKREWS® hole spacing must be used.