Two heavyweight aluminum sheets surround a layer of air
Recommended Surface : Concrete/Masonry
and even save some pictures in the Nest app for three hours
install the bulb and that's it-let the light sensor(photocell) take care of the rest
Western States 54082 Masonry Tapping Screw, 5 Lb. BF15 Two heavyweight aluminum sheets surroundHighlights: Slotted All weather 5# boxed Hex washer head Blue corrosion coating Dia. x lgth.: 1 4" x 2 1 4" Hardened steel, diamond point Diamond point provides self threading, Designed for quick, secure fastening for a variety of jobs in poured concrete, brick and cinder block masonry maximum holding power for fastening conduit clips, furring strips, junction boxes, expansion joints, wall partitions insulation, stud track, window door frames, duct