The new Denny Tools non-sparking valve spanner has been designed for use in explosive or flammable atmospheres, where regular tools may create potentially dangerous sparks when in use. Manufactured from a special Aluminium Bronze alloy, these ‘explosion proof’, non-magnetic and corrosion resistant valve spanners are suitable for use in a wide range of industries such as mining, petrol and gas extraction, petrochemical refineries, energy production and transportation, manufacture of explosives, plus many more. Hardness Brinell 229 - 291 Breaking 782N/ m㎡ - 989N/ m㎡ Elasticity Limit 450 - 550. Our valve spanner is also available in Beryllium Copper (Be-Cu) (prices on request).