First Alert SMI100 Battery-Operated Smoke Alarm Size:1.9 in H x 5.4 in L x 5.4 in W The Thunderbolt web features a

The Thunderbolt web features a thicker core than a standard drill bit

Dual Imperial and Metric laser etched rule

3' corner clamp is perfect for picture frames and smaller projects

scrub with sti-bristled brush

fast-drying polyurethane

First Alert SMI100 Battery-Operated Smoke Alarm Size:1.9 in H x 5.4 in L x 5.4 in W The Thunderbolt web features aThe First Alert SMI100 Battery Operated Smoke Alarm is available in a convenient two pack. The SMI100 smoke detector is equipped with First Alert's Precision Detection advanced sensing technology and meets new industry standards. This battery operated alarm is easy to install and the front access battery compartment makes for easy battery replacements. First Alert's Precision Detection advanced sensing technology complies with new industry standards