Does this come with the backing plate and nut?

No backing plate or nut included. Just the disc as seen in the pictures

Is there a specific rpm it should be used at ?

Most people just us this on their 4.5" angle grinder which don't typically have speed control. The ideal RPM is probably lower than that, but is you are careful to not build up to much heat the 4.5" angle grinders work well. 10-12k is the typical RPM advertised by grinders. Thanks, Pat

How to use shrinking disc

The disk works on the principle Of heating the high spot(s) by friction. Imagine waves on a lake from wind. Light or heavy. When the disk is in contact with the high spots it heats them up ONLY! But you have to keep the disk moving around. Just a short time. Say 30-40 seconds. Then move it away and cool the high area with a wet rag or a spray bottle of water. This causes the high area to contract. Repeat the process until the area is back flat or at the needed contour. DO NOT Place the disk on wet metal!! Only use it on CLEAN metal surfaces! If you over shrink it bump it back high and do it again. The disk isn’t like a torch. As it only heats fb the high spots. A torch heats the high and lows and over use of hammer and dolly’s Will only creat metal fatigue. Wear gloves and hearing protection.

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Dog River Tools Shrinking Disc 4 ½ Inch – Sheet Metal Fabrication Tool – Auto Body Panel Repair, Smoothing, Grinder

Dog River Tools Shrinking Disc 4 ½ Inch – Sheet Metal Fabrication Tool – Auto Body Panel Repair, Smoothing, Grinder

Product ID: 474471346

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Details

Grit material
Stainless
Product dimensions
11.4L x 11.4W
Brand
Dog River
Compatible devices
Angle Grinder
Grit type
Coarse

🔥Heat-shrinks metal via friction

⚙️4.5-inch diameter precision fit

🛠️304 Stainless Steel durable build

Description

🔥 Shrink, smooth, and shine like a pro with Dog River Tools! ⚙️

LIGHTWEIGHT YET DURABLE - Crafted from premium 304 stainless steel, this 152g disc balances strength and ease of use for prolonged work sessions.
VERSATILE METAL COMPATIBILITY - Works flawlessly on steel, stainless steel, aluminum, and brass—perfect for all your sheet metal projects.
PROFESSIONAL AUTO BODY RESULTS - Achieve smooth, blended, and tension-relieved surfaces that rival expert body shops, saving you time and money.
FRICTION GENERATED HEAT SHRINKING - Harnesses controlled heat to expertly shrink stretched or damaged metal panels exactly where you need it.
PRECISION FIT FOR STANDARD GRINDERS - Seamlessly attaches to any 4½-inch angle grinder with 5/8"-11 spindle thread for instant upgrade.

The Dog River Tools Shrinking Disc is a 4.5-inch, 0.055-inch thick stainless steel disc designed to fit standard angle grinders with a 5/8"-11 spindle thread. It uses friction-generated heat to shrink stretched or damaged metal panels precisely, working on steel, stainless steel, aluminum, and brass. Lightweight and durable, it delivers professional-grade auto body repair and sheet metal fabrication results.

Specifications

Manufacturer	Dog River Tools
Part Number	DRT-SD450
Product Dimensions	11.43 x 11.43 x 0.25 cm; 152 g
Item model number	DRT-SD450
Thickness	0.06 Inches
Power Source	Electric, Pneumatic
Item Package Quantity	1
Grit Number	60
Grit Description	Coarse
Batteries included?	No
Batteries Required?	No
Item Weight	152 g