Each trim piece comes apart in three sections for easy storage or shippingNo broken pieces

The sections push together and mount to the wall with screws into a stud.  Your shelf brackets (NOT INCLUDED) then insert into the grooves in the trim and screw into the stud (See example stock photos)

41.5” overall length or middle section can be left out for an overall length of 29.5”

Width is 5.25"

The last two pictures are stock photos included as examples. The first eight pictures are of what you will actually receive.