is it 4-1/2 x 1/4 x 7/8? I notice it is only described as 4-1/2 x 7/8. Pls help. Tks

Yes. 41/2 diameter x 1/4" thick with a 7/8" hole ( bore)

Is there an adapter to use on a 5/8 inch grinder

should use same arbor back flange and securing nut as an ordinary grinding wheel without threaded arbor, usually comes with grinder

I want to shave a door down about 3/8 inch. Would this work for the job?

mostly, this is used for grinding metals. To cut 3/8" wood, you need a saw not a grinder. Thanks

I think it you used it with a variable speed grinder at the slowest speed it would work for cleaning up the edges. For glass I just use a random orbital electric sander with 100 grit, since glaze is essentially glass, I would use caution on a rough grit.

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DEWALT Flap Disc, Zirconia, 4-1/2-Inch x 7/8-Inch, 80-Grit (DW8309)

Product ID: 13327836

Details

Brand
DEWALT
Compatible Devices
Angle Grinder
Grit Material
Zirconia
Grit Type
Medium
Product Dimensions
4.5"L x 4.5"W

⏳15x longer abrasive life

⚡3x faster material removal

🔧Ergonomic 20-25° grinding angle

Description

⚙️ Grind smarter, not harder — the DEWALT edge you can’t afford to miss!

TRUSTED BY PROS - Boasting a stellar 4.8-star rating from 839 users, this flap disc is the go-to choice for serious metalworkers.
UNMATCHED DURABILITY - Premium abrasive cloth extends disc life up to 15x, meaning fewer replacements and more uninterrupted workflow.
SEAMLESS COMPATIBILITY - Perfectly pairs with DEWALT angle grinders like the DCG416B, ensuring peak performance with trusted brand synergy.
TURBOCHARGED EFFICIENCY - Zirconia grit powers through metal 3x faster than standard discs, saving you precious time on every project.
PRECISION GRINDING ANGLE - Type 29 fiberglass backing engineered for an optimal 20-25° angle, delivering consistent, professional-grade results.

The DEWALT DW8309 4-1/2" x 7/8" 80 grit Zirconia flap disc delivers 3x faster metal removal and up to 15x longer life than fiber resin discs. Featuring a Type 29 fiberglass backing for a precise 20-25° grinding angle, it’s engineered for professional-grade durability and efficiency. Compatible with DEWALT angle grinders, this high-performance disc is a top-rated choice for metal grinding tasks.

Specifications

Asin	B000BQO76Q
Best Sellers Rank	#192,183 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #46 in Power Sander Fiber Backed Abrasive Discs
Brand Name	DEWALT
Compatible Devices	Angle Grinder
Compatible Disc Grinder Tool Models	DEWALT DCG416B
Compatible Material	Metal
Construction Type	Grinding
Customer Reviews	4.8 4.8 out of 5 stars (843) 4.8 out of 5 stars
Global Trade Identification Number	00028877310459
Grit Material Type	Zirconia
Grit Number	80
Grit Type	Medium
Included Components	4-1/2" x 7/8" 80 Grit Zirconia Flap Disc
Industry Standard Identifier	Type 29
Item Diameter	4.5 inches
Item Dimensions	4.5 x 4.5 x 0.9 inches
Item Dimensions L X W	4.5"L x 4.5"W
Item Thickness	4.5 inches
Item Type Name	4-1/2 X 7/8 80G T29 HP FLAP
Item Weight	1.6 ounces
Manufacturer	DEWALT
Material Type	Blend
Model	DW8309
Number Of Items	1
Part Number	DW8309
Recommended Uses For Product	Grinding
Unit Count	1 Count
Upc	028877310459

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TrustScore 4.5 | 7,300+ reviews

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