Spindle Thread Adapter 3/4 In. X 10 Tpi To 1 In X 8tpi Headstock Spindle Adapter At Penn 3/4 X 10tpi To 1 X 8tpi Adapter Material: The adapter body is made of steel. Install the internal thread of the spindle: 3/4 x 10tpi; Install the external thread of the chuck: 1 x 8tpi; Material Greatly extend the service life TASP Woodworking Lathe Spindle Adapter, designed to convert 1 x 8 TPI to 3/4 x 10 TPI threads for versatile chuck compatibility 3/4 x 10TPI to 1 x 8TPI Lathe Spindle Box Adapter Fit for Woodworking Lathe Specification:Install the internal thread of the spindle: 3/4 x 10tpiInstall the external thread of the chuck: 1 x 8tpiPlease note:Our woodworking lathe headstock spindle adapter is a 3/4 x 10tpi to a 1 x 8tpi adapter, the internal thread is 3/4 x 10tpi, external thread is 1 x 8tpi, please confirm whether it meets your needs before purchasingPackage includes: 1 x lathe spindle box adapter LA341018 Lathe Headstock Spindle Adapter 3/4 X 10Tpi to 1 X Suitable for: Allows a 3/4 x 10tpi threaded spindle to accept 1 x 8tpi threaded chucks, faceplates, and other woodturning tools and accessories