The Smithing casket contains a variety of skilling resources, but more importantly, skilling outfit pieces.

Smithing casket
ExamineMay contain a smith's outfit or bars.
Properties
TradeableNo
EquipableNo
StackableNo
NoteableNo
OptionsOpen, Drop
Values
Value0 coins
AlchemyNot alchemisable
Weight0 kg
Advanced data
Item ID? (edit)

Each individual piece will provide a 2% Experience boost while training Smithing, with the exception of the gloves and boots that only provide 1%. While wearing the full set another 2% bonus is applied, in total providing a 10% Experience boost.

Shops

Seller Item Amount in stock Price sold at
Skilling Points shop   Smithing casket 50,000 Skilling points
AFK Tokens shop   Smithing casket   1,000
Source Level Item Quantity Rarity
Event chest N/A   Smithing casket 1 Uncommon
Sponsor treasure N/A   Smithing casket 1 Uncommon

Rewards

Always Drops

Item Quantity Rarity Price High Alch
 Coins250,000Always250,000250,000
 Coal50Always10,2001,350
 Steel bar50Always22,0003,000

Common Drops

Item Quantity Rarity Price High Alch
 Coins500,000Common500,000500,000
 Coal100Common20,4002,700
 Mithril bar20Common16,2203,600

Uncommon Drops

Item Quantity Rarity Price High Alch
 Mithril bar30Uncommon24,3305,400
 Adamantite bar30Uncommon65,91011,520
 Runite bar30Uncommon374,16090,000

Rare Drops

Item Quantity Rarity Price High Alch
 Runite bar50Rare623,600150,000
 Pet Dwarf1RareNot soldN/A

Very Rare Drops

Item Quantity Rarity Price High Alch
 Smiths faceguard1Very rare; 1/5Not soldN/A
 Smiths tunic1Very rare; 1/5Not soldN/A
 Smiths trousers1Very rare; 1/5Not soldN/A
 Smiths gloves1Very rare; 1/5Not soldN/A
 Smiths boots1Very rare; 1/5Not soldN/A