The main RuneScape Wiki has an article on: Mithril Square Shield
The Old School RuneScape Wiki also has an article on Mithril Square Shield.

A Mithril Square Shield (commonly referred to as a mith sq) is a shield which requires level 20 Defense to equip. It can be made from 2 mithril bars at level 58 Smithing, yielding 100 Smithing experience.

Bonuses

Dropped by

Monster Combat level Quantity Rarity
Fire Giant 109 1 2Common
Ice Giant 68 1 3Uncommon
Chaos Dwarf 59 1 4Rare
Lesser Demon 79 1 4Rare

Shop

Shop Stock
Cassie's Shields 0


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