Fits 1" x 8 TPI Wood Lathes: This 4-jaw wood lathe chuck features a 4-inch outer diameter and an M33 x 3.5 mm internal thread. The 1" x 8 TPI adapter fits 1" x 8 TPI lathe spindles, making it ideal for most medium and large woodworking lathes Inside Clamping, Outside Support: 4-jaw adjustment via two locking bars. With a 1.5-2.8 in/39-72 mm inside clamping range and a 2-3.5 in/50.5-89 mm outside support range, this wood lathe chuck holds different workpiece shapes firmly Self-Centering Design: Our self-centering lathe chuck automatically keeps your workpiece centered during high-speed rotation. It minimizes misalignment without repeated manual adjustments, improving machining efficiency Wood Screw Mounting: The wood turning lathe chuck includes a tapered screw designed for large, flat wooden workpieces. You can quickly secure the workpiece by drilling a 1 in deep, 0.3 in diameter hole at its center

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