Like the sanguophage's piercing spines, but as a utility item. One of the roles of spines is to soften an enemy before fighting him in melee, which can be useful to increase the chance of 1-shot, and decrease the chance of taking any melee damage yourself.
Throwing knives is a cheap and low-tech alternative for the same job.
[list]
[*] Go in utility slot
[*] Each knife deals 12 damage
[*] 15% AP
[*] 4.9 Radius
[*] Minimum range of 1 block; can't be used on adjacent pawns
[*] 30 steel to craft
[*] 6 shots total
[*] Can be refilled for 5 steel per knife restored
[*] Item destroyed when empty
[*] Crafting unlocked with Smithing research
[/list]
I stole sprite from dying light 2.