The Tool Kit is an exclusive item to spin-off title, Silent Hill: Book of Memories. In the game, melee weapons have a durability meter that shows the player when their current weapon is about to break. Tool kits can be used to fully replenish a melee weapon's durability.
They can be purchased at Howard's Shop for 300 MR, or found scattered throughout the dungeons. The player is originally limited to carrying only one tool kit at a given time, but this number may increase depending on the number of backpack upgrades the player has purchased.