PanaVise 856-T Telescoping Shaft (Black) Shaft locks tightly and is indexed to prevent rotation /4-20 mounting stud; 1/4-20 internal thread at opposite end Use as an extension for an existing shaft or can be used alone Custom Telescoping Shaft Telescoping Shaft extends from 6.75-Inch (171.4mm) to 11-Inch (279.4mm) Shaft locks tightly and is indexed to prevent rotation 0.25-Inch 20 mounting stud; 0.25-Inch 20 internal thread at opposite end