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Carnation

Plastic Washers

Polypropylene washer 

http://www.ebuildingproducts.com/proddetail.php?prod=DP-DP300&cat=381

1.75" diameter

$58 for 1000

 

The following are less good (1" diameter) but cheaper...

Ideal Security Inc. SKPHC 500/Box Plastic Cap Washers, White Plastic

http://smile.amazon.com/Ideal-Security-Inc-SKPHC-Plastic/dp/B005TE3C1G?ie=UTF8&psc=1&redirect=true&ref_=ox_sc_sfl_title_1&smid=ATVPDKIKX0DER    $12.58 for 500

 

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