2 Finger EDC Brass Knuckle DFK 03 Cerakote Coating H-306 Ruby Red

Dimensions:
Material - Aerospace Aluminum
Coating - Cerakote H-306 Ruby Red
Height - 2 11/64" (55 mm) 
Width - 2 13/32" (61 mm) 
Thickness - 43/64" (17 mm) 
Finger hole diameter - 1" (25 mm)
Weight - 3 oz / 90 grams

More similar products you can find here:
buy aluminum edc brass knuckles coated with cerakote online in the USA

Special holes allow you to use this product as a keychain. 
You can also thread a paracord (550-type) lanyard through the holes.
Nice gift for Him.

EDCCraft-Store official website is the best place to buy original EDC-products at manufacturer's price.