Heavy duty 250 amp booster cables never be caught with a dead car battery with these heavy duty 250 amp booster cables keep these cables in your car in this handy storage bag for any such occasion the cables are recommended only for petrol type engines up to 3000cc and are 2 metres long with fully insulated heavy duty crocodile clips booster cables 250 amp heavy duty crocodile clips 2m length recommended for petrol engines up to 3000cc multi 2m