What size drill bit is needed for install?

Hello, Thank you for your question, The mounting hole size of the rivet nut is 6.9mm, The mounting hole size of the screw is 5.2mm.

What is the maximum thickness of material the rivenuts can fasten through ?

Hello, I'm glad to answer your question. The M5 riveting nut can be used for steel plates of 0.5-3mm thickness. Gaskets and screws and nuts are made of stainless steel. The specific size can be referred to the second image of listing. Thank you

are these washers solid? (ie., flat on the bottom)

Hi, The washer is made of stainless steel CNC, The bottom is a solid plane.

What size drill but to make holes in my fenders?

Hello This rivet nut size is M5 and its bottom hole requires 7mm. So you need to drill 7mm holes. Thank you

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STETION Stainless Steel 25 Pcs Fender Bumper Washer Bolt M5x18mm CNC Finishing Washer Engine Bay Dress Up Fastener Kit Flares Widebody kit Installation hardware

STETION Stainless Steel 25 Pcs Fender Bumper Washer Bolt M5x18mm CNC Finishing Washer Engine Bay Dress Up Fastener Kit Flares Widebody kit Installation hardware

Product ID: 346733153

Details

Size
#5-20
Colour
Stainless
Material
Stainless
Brand
STETION
Item dimensions L x W x H
18 x 18 x 3

🔩25pcs M5x18mm bolts - extended threaded length

🧪Salt spray tested - corrosion resistant

🛠️CNC machined stainless steel - precision & durability

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Description

🔧 Elevate your ride’s style with precision-engineered fasteners that mean business.

EXTENDED M 5 X 18 MM BOLTS - Longer threaded bite ensures a secure, reliable fit for your fender, bumper, or ducktail installation.
PRECISION CNC STAINLESS STEEL - Machined for a sleek, rust-proof finish that stands up to the elements and time.
COMPLETE 25 PIECE FASTENER KIT - Everything you need for a flawless widebody or engine bay upgrade—washers, bolts, rivet nuts, plus a hex wrench.
SALT SPRAY TESTED FOR DURABILITY - Engineered to resist corrosion, keeping your hardware looking fresh and professional season after season.
UNIVERSAL FIT FOR WIDEBODY DRESS UP - Perfect for fenders, bumpers, headlights, trunks, and license plates—upgrade your ride’s style effortlessly.

The STETION 25-piece fastener kit includes M5x18mm stainless steel bolts, washers, rivet nuts, and a hex wrench, all CNC machined and salt spray tested for superior corrosion resistance and durability. Designed for automotive widebody kits, fender and bumper installations, this kit offers extended bolt length for secure fastening and universal compatibility, making it the go-to hardware upgrade for professional-grade vehicle dress-up projects.

Specifications

Fastener Type	Rivet, Bolt
Head Style	Hex
Finish Type	Plain
Shape	Round, Cylindrical
Item Diameter	5 Millimetres
Thread Size	M5x18mm
Number of Pieces	25
Compatible groove diameter	5.5 Millimeters
Manufacturer	STETION
UPC	756588129656
Item model number	SH-0427-A
Exterior	Stainless Steel
Manufacturer Part Number	SH-0427-A
Item Weight	231 g

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