JBF National's stainless steel ball plungers make sure that all of your alignment and attachment needs are carried out with the utmost precision. This plunger features a screw driver slot for easy installation, and a stainless steel construction for maximum corrosion resistance. Except for thread sizes 4-48 through 8-36, an optional nylon threading patch is available. Ball plungers are utilized across of wide variety of industries and products, including woodworking, medical and military applications. Contact a JBF National sales engineer today for further information. Add P" to part number for nylon patch."