Rectangular Westinghouse Lightning Arrester Caps. 6" x 4.25" x 1.75". Excellent condition. Note that I have never seen an actual Lightning Arrester that used rectangular caps (normally they are round, with a flared base on the bigger ones). If anyone has seen an arrester with this type of cap, I'd lover to know about it. $20 each for the caps plus actual shipping (buy one or both).