Chuck, 4-inch wood lathe (100 mm) with M33x3.5 threads and 1" x8TPI and M18x2.5, is a self-centering metal adapter with four jaws, and it is a lathe accessory.

100 mm 4 jaw self-centering wooden lathe chuck- Outer diameter of the round jaw grip: 51 mm - 79 mm, inner diameter: 42 mm - 68 mm.- Spindle mounting thread:• M33x3.5 mm• M18x2.5 mm• 1 inch × 8 TPI The package contains:- 1 × chuck body with a round jaw set- 1 × wood worm screw- 1 × wrench- 2 × tightening arms Attention:- Please check the size of the lathe spindle nose for some brands of wood lathes and ensure that this chuck's thread is compatible with your wood lathe before ordering.