First Alert Plug-In Carbon Monoxide Alarm with Battery Backup Type:Carbon Monoxide Alarm There are 3 cutting edges

There are 3 cutting edges for added durability and the full screw tip allows the bit to self feed for easier pull-through

Available in Stainless Steel and Galvanized Steel (with a Black Powder Coat Finish)

Corrosion-resistant coating helps prevent rusting

Consecutive inches to 16ths

Smooth interior ideal for pulling cable

First Alert Plug-In Carbon Monoxide Alarm with Battery Backup Type:Carbon Monoxide Alarm There are 3 cutting edgesThe First Alert CO606 Carbon Monoxide Plug In Alarm with battery backup features an electrochemical CO sensor to alert you to carbon monoxide. This carbon monoxide detector plugs into any standard electrical socket to monitor CO levels in your home. The simple, user friendly design features battery backup to allow for continuous monitoring, even in the event of a power outage. Battery backup allows for continuous monitoring during power outages Single