for use with fi8910w & fi8920w7-pieces fully interchangeablecustomizable into 12 configurationsbuilt with heavy duty materialscontains 1" rotatable head, 2" drop ceiling "x" clips, 2 3/8" standing/wall mount bases, 2x2" shaft & 1x1" shaftblackupc : 859365003214 dimensions : 2. 00in x 6. 00in x 3. 00inestimated weight : 0. 2169.