Brass-plated pyramid knob with top hole for standard #6 beaded chain. The bottom threaded hole is 3/8" and works with standard 1/8 IPS pipe. Outside bottom diameter is 9/16" and it is 11/16" tall. This only works with beaded miniature #3 chain and not with the "standard #6" chain. We combine with other items to save shipping. $1 each. Shipping is $3.38 plus $.14 for each additional piece.Combined shipping- to get cheapest shipping costs (when buying different items)please buy what you need (WITHOUT SHOPPING CART) and “request invoice” (BEFORE YOU PAY) so we can send invoice with lower shipping costs. SHOPPING CART DOES NOT SEEM TO WORK FOR COMBINED SHIPPING.