Rig Maintenance
ATN Ascender
The only rope ascender designed for the marine environment. Stainless steel, so it will not rust, with an open design that fits over a taut halyard, synthetic shroud, or stay from 3/8" to 5/8".
About the Ascender
The Ascender is manufactured exclusively for ATN by CMI, a climbing product specialist, and it is built for one job most climbing ascenders cannot do: living on a boat. Aluminum climbing hardware corrodes in salt air; the ATN Ascender is stainless steel and does not rust.
Because the design is open on one side, it fits OVER a line that is already tensioned. You do not need to thread the end of the halyard through it. That is what makes it practical as mast-climbing gear and as a safety device.
Use it to climb the mast alone, or run it on a second halyard as a safety backup while climbing with the ATN Mastclimber. A pair of Ascenders also retrofits an old Topclimber to modern hardware.

Pricing and specifications
| ATN Ascender, single | $121.00 | |
|---|---|---|
| ATN Ascender, pair | $229.90 |
| Material | Stainless steel (will not rust) |
|---|---|
| Fits line sizes | 3/8" to 5/8" |
| Design | Open side fits over a tensioned halyard, shroud, or stay |
| Made | Manufactured exclusively for ATN by CMI, a climbing product specialist |
| Works with | Any rope halyard; companion or safety for the ATN Mastclimber |