Single Finger Knuckle Brass SFK 01 Damascus Steel

Dimensions:
Material - Damascus Steel
Finish - Polished
Height - 2 3/64" (52 mm)
Width - 1 15/32" (37 mm)
Thickness - 43/64" (17 mm)
Finger hole diameter - 1" (25 mm)
Weight - 5 oz (140 grams)

More similar products you can find here:
buy damascus single finger brassknuckles online 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.

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