This is the GMS Industries Best-style 7-Pin SFIC (Small Format IC Core) Mortise Cylinder Housing. This mortise cylinder housing includes an "ST" Adams-Rite Cam and is designed to hold the Best-style cylinders. The finish of this housing is US26D. Please take note that this housing is specifically compatible with 7-pin Best style SFIC cores and will not accommodate 6-pin cores without a Spacer.