What is the actual tread size as I need to screw it into a drill chuck?

The thread you see is for the buff wheels or grinding wheel. The shaft from the motor goes in to the arbor. It's not designed for a drill chuck. But you can make someone work.

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⚙️ Upgrade your grind game—because your tools deserve a glow-up!

ALL IN ONE PRO KIT - Includes adapter shafts, washers, nuts, and a hex wrench—everything you need to transform your bench grinder instantly.
UNIVERSAL COMPATIBILITY - Perfect for buffing wheels, grinding wheels, wire brushes, and drill chucks—expand your tool’s capabilities effortlessly.
HEAVY DUTY METAL CONSTRUCTION - Durable, corrosion-resistant metal ensures long-lasting performance under demanding workshop conditions.
PRECISION FIT EFFORTLESS UPGRADE - Seamlessly convert your motor shaft from 8mm to 10mm for versatile tool compatibility.
DUAL THREADED SHAFTS FOR MAXIMUM FLEXIBILITY - Operate left and right threaded shafts simultaneously to tackle any polishing or grinding task.

The HTYU Shaft Arbor Extender Kit converts 8mm motor shafts to 10mm with dual left and right threaded adapters, enabling simultaneous use of polishing and grinding wheels. This compact metal kit includes washers, nuts, and a wrench, making it an essential upgrade for professionals seeking versatile, durable, and efficient bench grinder extensions.

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KSh1323

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Manufacturer	HTYU
Part Number	O-087
Item Weight	6.7 ounces
Product Dimensions	2.72 x 0.67 x 0.67 inches
Color	Gray
Style	Angled
Material	Metal
Batteries Included?	No
Batteries Required?	No

Shaft Arbor Extender 8mm to 10mm Motor Arbor Adapter Bench Grinder Extension Shaft Threaded Shaft Backing Kit for Polisher Sander Polishing Grinding Buffing Wheel Rotary（1 Left + 1 Right

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