6 Feb Nipple size, shape, color and whether they are flat, inverted or erect vary from guy to guy and woman to woman. Basically, no two nipples are exactly the same even if they are on the same body. All of the different types of nipples are usually normal unless your nipples suddenly change from being straight. Home · Products · Vacuum Hardware · Adapters; Straight Nipples. Straight Nipples. Contact Us for More Information · Ebara · Markets Served · Products · Service & Support · Contact Us · Sitemap. © - EBARA Technologies, Inc. / Optimized Design by MoreVisibility. DescriptionMaterial:Steel or stainless steelVersion:Steel hardened, min. HV 1, galvanised. Stainless steel ktube.co:The conical head grease nipples have a tapered thread. They are suitable for grease points which must be lubricated often and reliably. Their versatility makes them the most widespread type of.