Do these have magnet to hold the plugs

No. They have a rubber gasket that holds the plug

what is the outside diameter of 18mm socket

The outside daimeter of the 18mm socket is 26mm. I tired to use it on my Triumph 900 triple engine and it did not fit in the recess. There is a craftsman thin wall 18mm socket that is thinner than this one which worked for me.

Do one of these sockets fit a Champion RC12YC spark plug?

Champion makes sparkplugs in at least 8 different hex sizes. If that plug is 5/8", you are covered.

Do these include metric sizes

The set has English and Metric sockets; I just checked and the set is 14 and 18mm as well as 13/16, 5/8, and 3/4th inch sockets.

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Description

🛠️ Grip it, twist it, own it — the ultimate spark plug socket set for the savvy pro!

BUILT TO LAST - Crafted from polished chrome vanadium steel for superior strength and corrosion resistance.
VERSATILE SIZE RANGE - Includes 14mm, 18mm, 5/8", 3/4", and 13/16" sockets to cover all your spark plug needs.
COMPACT LIGHTWEIGHT - At just 1.33 pounds and slim dimensions, it’s the perfect portable upgrade for pros on the go.
SEAMLESS COMPATIBILITY - Designed for 3/8" drive tools or combination wrenches, fitting effortlessly into your existing toolkit.
PRECISION GRIP ZERO SLIPS - Internal rubber ring securely holds spark plugs for flawless installation and removal.

The Powerbuilt 3/8-Inch Drive Spark Plug Socket Set is a 5-piece, deep thin wall socket collection made from durable chrome vanadium steel. Featuring an internal rubber ring for secure spark plug handling, it includes both metric and SAE sizes compatible with 3/8" drive tools, delivering professional-grade performance in a compact, polished design.

Specifications

Brand	Powerbuilt
Material	Chrome Vanadium Steel
Drive System	Hex, Square
Finish Type	Polished
Number of Pieces	5
Drive Bit Shank Style	3/8-Inch Shank
UPC	028907266978
Global Trade Identification Number	00028907266978
Bit Compatibilities	3/4 inches
Manufacturer	Powerbuilt
Part Number	640855
Item Weight	1.33 pounds
Product Dimensions	9.9 x 3.7 x 0.7 inches
Item model number	640855
Is Discontinued By Manufacturer	No
Size	Spark Plug
Color	Grey
Style	5pc
Finish	Polished
Pattern	fastener drive bit
Volume	1 Milliliters
Item Package Quantity	1
Head Style	Fixed Square
Measurement System	inch, metric
Compatible Fastener Range	0.75 inches
Batteries Included?	No
Batteries Required?	No