Extra narrowband SII-CCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Extra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

The H-ALPHA 7nm filter is the most popular narrow-band filter that allows a 7nm bandwidth centered on a 656nm wavelength.

Extra Narrowband OIII-CCD 6.5nm filter is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

Extra narrowband SII-CCD 6.5nm filter (Sulful II for CCD) is designed for nebula observation allowing 6.5nm bandwidth of light centered on a wavelength of 672nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).

A multi-tool designed for camping, hiking and any type of outdoor adventure!

An essential tool for EMTs or first responders with a 154CM serrated blade and a carbide glass break bit.

Crafted for everyday adventures, it features crucial tools including upgraded, replaceable wire cutters.

If you’re looking for maximum functionality, look no further.

Designed for unmatched comfort, durability, and ease-of-use, the P2 represents decades of consumer feedback, testing, and engineering. Integrated FREE™ technology means all 19 tools are easily accessed with one hand, open smoothly, and click into place with a confident snap. Proudly made in Portland, Oregon.

Say hello to the most advanced multipurpose tool ever made.

A more robust version of the P2, the P4 also includes a saw and 420HC serrated knife so you’re prepared for every job. Even with 21 tools, it weighs in at a barely-there 8.6 ounces and has a closed length of just 4.25 inches, so it’s just as comfortable in your pocket as on your belt. Designed and manufactured in Portland, Oregon.

Lightweight and portable, the FREE™ K2 packs essential, everyday tools into a folding pocket knife.

With a 3.3 inch blade and seven additional tools, including a pry tool and Phillips screwdriver, the K2 is multipurpose redefined. Each implement is housed on the outside of an ergonomically refined aluminum body for easy access, so you’re never left fumbling in a pinch. Made proudly in Portland, Oregon and covered by our 25-year warranty.

Lightweight and portable, the FREE™ K2 packs essential, everyday tools into a folding pocket knife.

With a 3.3 inch blade and seven additional tools, including a pry tool and Phillips screwdriver, the K2 is multipurpose redefined. Each implement is housed on the outside of an ergonomically refined aluminum body for easy access, so you’re never left fumbling in a pinch. Made proudly in Portland, Oregon and covered by our 25-year warranty.

Access the mini-pry, spring-action scissors, or the robust 420HC knife blade - all with one hand.

The K4 has all the essential features of the K2 with the added utility of spring-action scissors for an even wider range of tasks. And since its revolutionary magnetic architecture eliminates friction and wear, you can look forward to a lifetime of use. Proudly made in Portland, Oregon.

Access the mini-pry, spring-action scissors, or the robust 420HC knife blade - all with one hand.

The K4 has all the essential features of the K2 with the added utility of spring-action scissors for an even wider range of tasks. And since its revolutionary magnetic architecture eliminates friction and wear, you can look forward to a lifetime of use. Proudly made in Portland, Oregon.

A multi-tool designed for camping, hiking and any type of outdoor adventure!

Best-selling multi-tool ever gets upgraded with replaceable wire cutters made in a premium material.