Single Knuckle Duster SFK 01 Copper with Patina

Dimensions:
Material - Cooper
Coating - Patina
Height - 2 3/64" (52 mm)
Width - 1 15/32" (37 mm)
Thickness - 43/64" (17 mm)
Finger hole diameter - 1" (25 mm)
Weight - 5.6 oz (160 grams)

More similar products you can find here:
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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.