Fast Blow Glass cartridge Fuses 5x20mm- 80pc Assorted (0.5A 1A 1.5A 2A 3.15A 4A 5A 6.3A)

How accurate are these fuses? Can they be used in sensitive equipments like AV receivers or other high end electonic equipment ?

is it 250v ? seller did not say anything about volts ?

I have v-gaurd stabilizer and fuse is gone.. on the fuse it is mentioned as t4al250v.. which one should i purchase

As per photo 1.5 A fuse not mention. Is it available in box