Inquiry (采购产品): glass balls Please quote 12 glass balls in with either 6 mm diameter or 1/4" diameter. (6mm preferred if both are in stock). The tolerances from sphericity and the nominal diameter should not exceed 0.025 mm or 0.001". A polished surface is preferred. Please quote a minimum order if necessary. To make the minimum order, if you can, please quote for related kinds of glass in groups of 12. Thank you. **** Hidden Message ***** Zachary Levine 20899-8410 Company: National Institute of Standards and Technology E-mail: zlevine@nist.gov **** Hidden Message ***** zlevine@nist.gov