The chest under the red steel anvil will have the following items inside:
Red Steel Shovel Head
Red Steel Hoe Head
Red Steel Axe Head
Red Steel Hammer Head
Red Steel Chisel Head
Red Steel Sword Blade
Red Steel Mace Head
Red Steel Saw Blade
Red Steel Pickaxe Head
Red Steel Prospector's Pick Head
Red Steel Scythe Blade
Red Steel Knife Blade
Red Steel Javelin Head
Red Steel Tuyere
Red Steel Boots (Complete and undamaged)
Red Steel Greaves (Complete and undamaged)
Red Steel Chestplate (Complete and undamaged)
Red Steel Helmet (Complete and undamaged)