Rectorseal 81914 TRUaire MV4 Retrofit 8" x 8" 4 Way Grille/Damper Box 6, 7, 8" NML1 or switch to the 1/16"

or switch to the 1/16" cutter for thinner material

Direct molded insulation for protection against electrical shock and arc flash explosion

Engineered for use with impact drivers

one two sided bit

Rectorseal 81914 TRUaire MV4 Retrofit 8" x 8" 4 Way Grille/Damper Box 6, 7, 8" NML1 or switch to the 1/16"Rectorseal 81914 TRUaire MV4 Retrofit 8" x 8" 4 Way Grille Damper Box 6, 7, 8" One piece air diffusers with air tight design that eliminates the need for tedious mastic & external sealers, making diffuser installation no longer a two man job, Choose from five grille styles to deliver optimum air flow & movement pattern for any room. A plastic ceiling diffuser with incorporated ceiling box. For residential light commercial use in 8" x 8" square.