with a nominal major thread diameter of 0 2115 inch to enter the top inner bore 68 easily the fixture bracket fastener 44 can then be screwed partially into the bottom inner bore 70 where it makes its own threads in the smooth surface 70 a and can be advanced until it is held securely for shipment the fixture bracket fastener 44 can then easily be removed by an installer at the job site and repositioned to the proper location to secure a ceiling fan or other fixture to a rafter through one of the elongated slots not shown in fig5 as shown in fig5 once inserted in the holster 60 the point 72 of the fixture bracket fastener 4 is enclosed within and protected by the holster 60 the holsters 60 therefore protect the ends or points 72 of the fixture bracket fasteners 44 during storage and shipment of the box the prepackaged mounting assembly 10 of this disclosure may have relatively deep side walls 18 as shown in fig6 or it may be manufactured with deeper or shallower side walls as desired for the specific application when mounted within the holsters 60 for shipment and storage essentially the entire length of the fixture bracket fastener 44 is recessed within and protected by the side walls 18 of the mounting assembly 10 as shown in the side sectional view of fig6 the side walls 18 can be made deeper if preferred to provide more space for electrical connections or shallower if desired for shallower boxes the holsters 60 typically can extend from the top 66 of the first junction box 14 and accommodate the point 72 and essentially the entire length of the fixture bracket fastener 44 the purpose and.