Hammer Gloves

The Hammer Gloves is an upgrade, exclusively for Knuckles the Echidna, that appeared in Sonic Adventure 2 and Sonic Adventure 2: Battle. They are a pair of knuckle duster-like gauntlets that allows Knuckles' Punch Attack to destroy iron craters. Using this upgrade leaves a red energy trail when punching. They are the equivalent to Rouge the Bat's Iron Boots.

Location
The Hammer Gloves can be found inside the Death Chamber. At the beginning of the stage, hit the hour glass in front of you and a door that leads into a hallway should open. Head then into this hallway before the door closes and the Hammer Gloves will be located in the first room on the right after entering the hallway, which entrance is blocked by some wood craters.

Sonic the Hedgehog (Archie)
Knuckles the Echidna used the Hammer Gloves in the Archie Comics's Sonic the Hedgehog from #138 to #141. He used them to increase his strength against the Dingoes because he had lost his powers and became extremly weak after coming back to life. They were later discarted by Sonic when they were about engage Hunter in battle, as he prefered to travel "light" and Knuckles left them fully behind after regaining his lost powers from exposure to the Master Emerald's energies.

When Jon Grey drew them they looked like a black cover over most of his hands. When Steven Butler drew them on the recap page in Sonic the Hedgehog #138, the Hammer Gloves greatly resembled the Shovel Claws from Sonic X, only they were black instead of gray.