Depends what you're cutting but one disc should last for like.. 50 M8 bolts. Don't know really. For £1.11 a disc I don't tend to keep track. The deburring flap disc will last for hundreds of bolts.
Ah, you're referring to the grit discs. The diamond ones are about 20 quid a throw.
You don't need a diamond disc to cut steel bolts.
@Sharkstar started
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Depends what you're cutting but one disc should last for like.. 50 M8 bolts. Don't know really. For £1.11 a disc I don't tend to keep track. The deburring flap disc will last for hundreds of bolts.