Stainless Steel Impingers and Accessories are manufactured with #28 Ball and Sockets, 2" diameter and a 500ml capacity. Stainless Steel Impingers are interchangeable with glass impingers for many applications. This kit includes an impinger with Double "L" Inlet Stem, one impinger with restricted inlet U-Stem, two impingers with plain inlet U-Stem, straight inlet stem, five #28 ball joint clamps.