"Two" much of a good thing? Then let's pick one slot size and make it metric.
Kusy
Robert P
RP
D003764:Dental Materials / Q000737:chemistry; D006801:Humans; D016382:Orthodontic Appliance Design / Q000592:standards; D016910:Orthodontic Brackets / Q000592:standards; D009969:Orthodontic Wires / Q000592:standards; D013499:Surface Properties; D013674:Technology, Dental
D003764:Dental Materials