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2 Pack 933 Unitized Wheel Mandrel, 2” x 1/4” x 1-1/4”, for attaching 2” – 4” Diameter – 1/4” Center Hole Buffing, Polishing, Unitized Wheels to Rotary Tools, Pack of 2

4.5 (2) Write Review
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$9.85

$ 4 .99 $4.99

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About this item

  • WHAT’S INCLUDED: 2 each Pro-Graad 933 Unitized Wheel Mandrels for Drill or Die Grinder 1/4” Round Shank 5/16" Diameter Threads Wheel Arbor Adapter. Mandrel Dimensions: Overall Length: 2-3", Washer Diameter: 1-1/4", Shank Length: 0.8".
  • [UNIVERSAL COMPATIBILITY]: Designed to attach 2” – 4” diameter non-woven unitized or buffing polishing wheels with 1/4" arbor hole to a variety of rotary tools, such as die grinders.
  • [SECURE & VERSATILE FIT]: Holds wheels with thicknesses of 1/4", 1/2", 3/4", or 1", featuring a 1/4" center hole, for a wide range of applications.
  • [EASY INSTALLATION]: Insert the 1/4" adapter shank into your drill, drill press or die grinder and on the other side, hold the wheels that have a 1/4" center hole. The package comes with 2 washers that sandwich the wheels from both sides, ensuring maximum support and tightness.
  • [TRANSFORMATIVE]: The 933 Wheel Mandrel can transform your drill, drill press or die grinder into a buffer, polisher, grinder by using this mandrel with your drill to mount 1/4 inch arbor hole discs and wheels.
  • [PRODUCT GUARANTEE]: All Pro-Graad products are made with quality materials, which exceed ANSI and EU standards. We are driven to deliver high-quality, high-performing products to the end user. This is why we stand behind our 100% Product Guarantee. If you are not satisfied with the product, simply return your purchase within 30 days, and we will replace or refund your order. Pro-Graad is an American Company with US Based Customer Support.


The Pro-Graad 933 Unitized Wheel Mandrel (2 Pack) is designed to securely attach 2" – 4" diameter unitized wheels to rotary tools, such as die grinders. This mandrel offers a versatile fit, accommodating wheels with thicknesses of 1/4", 1/2", 3/4", or 1", featuring a 1/4" center hole (wheels sold separately). Its washer flanges, with a 1.25" outside diameter, ensures stability for working on small or intricate workpieces. With a 2.3" overall length and 1.25" diameter flanges, this mandrel holds the wheel firmly in place, allowing for smooth edge deburring and finishing applications. The mandrel supports a maximum speed of 14,000 RPM, ensuring high-speed performance for demanding tasks. It is designed to fit a rotary tool with a ¼” collet, making it a reliable choice for various applications. For mounting unitized wheels with a density of 6 or higher, a 5/16" wheel center hole is recommended. The Pro-Graad 933 Mandrel offers durability, precision, and efficiency, making it an essential accessory for anyone working with unitized or buffing polishing wheels in detailed finishing tasks.


Subtropical retirees
Reviewed in the United States on September 30, 2024
The item is ordinary zinc plated steel. Does not appear to be made from a high carbon tool steel. It comes with both flat washers and washers with spurs to hold cotton or felt buffing wheels. I like the spurs to keep pads from spinning on the shaft. You could put small diameter or light duty grinding wheels on it for sharpening lawn mower blades.It is meant for chucking in a collet or drill for light duty applications. Large, heavy wheels and buffs should be used with bigger diameter arbors made from quality tool steel.
Lori G
Reviewed in the United States on September 27, 2024
I’ve been looking for a mandrel to use with my new die grinder so I can attach small 3” cut off wheels instead of dragging out my angle grinder every time.I was hopeful these would work and they do! Honestly, I saw one of those “hack” videos that showed how to create a mandrel from bolts washers and nuts, but this was a whole lot easier.The nut stays tight and holds the washers against the wheel meaning they are secure but still able to spin easily to accomplish the cuts. Doesn’t get any better than that -nor does it need to.