Single Finger Knuckleduster SFK 02 Stamp Sandblasted Brass

Dimensions:
Material - Brass
Finish - Sandblasted
Height - 1 15/16" (49 mm)
Width - 1 15/32" (37 mm)
Thickness - 43/64" (17 mm)
Finger hole diameter - 1" (25 mm)
Weight - 5.3 oz (150 grams)

More similar products you can find here:
real brass one finger brass knuckle dusters price in the USA

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

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