Granite helm is a helmet that can be obtained by killing terror dogs or from High Level Gambles at Barbarian Assault. 50 Strength and 50 Defence are required to equip the helm. It has slightly better stats than the rune full helm but slightly worse stats than the dragon med helm. It is not a popular helmet because it is hard to obtain, and players can buy either a rune helm or a dragon med helm, which are far cheaper options.
Despite this, the granite helm has superior ranged defensive stats compared to rune and dragon (but inferior to the dragon full helm). This also applies to other pieces of granite equipment.