First Alert SMI100 Battery-Operated Smoke Alarm Work Belts & Suspenders It comes with 5/8" OD

It comes with 5/8" OD x 42" long (segmented into 3 sections for flexibility)

and the fractional blade graphics help make measurements quick and easy

The Coupler Lock is designed to fit 1-7/8 in

Eight built-in safety features including a cover locking system that allows pressure to build only when the cover is securely closed and prevents the cover from being opened until pressure is safely reduced

fold-down locking handle

First Alert SMI100 Battery-Operated Smoke Alarm Work Belts & Suspenders It comes with 5/8" ODThe 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